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# Viasonix Ltd.: Viasonix is a medical device manufacturer specializing in high-end vascular physiologic systems, transcranial doppler equipment, and home care devices.

## Sitemaps
[XML Sitemap](https://viasonix.com/sitemap_index.xml): Includes all crawlable and indexable pages.

## Posts
- [Viasonix Dolphin TCD Featured in Dubai TCD Workshop](https://viasonix.com/viasonix-dolphin-tcd-featured-in-dubai-tcd-workshop/): During a TCD workshop in Dubai, clinicians explored practical cerebral blood flow assessment using Viasonix Dolphin TCD systems and robotic TCD technology.
- [ABI Is Only the Start: When PAD Evaluation Needs TBI, PVR, and Doppler](https://viasonix.com/abi-is-only-the-start-pad-evaluation-tbi-pvr-doppler/): In PAD evaluation, ABI is often the first test performed - but not always the last one needed. Learn when TBI, PVR, Doppler, and post-exercise ABI help clarify perfusion and support a more complete vascular lab workflow.
- [Record-Breaking 2025: How Viasonix Reached Its Best Sales Year in Company History](https://viasonix.com/record-breaking-2025-viasonix-reached-its-best-sales-year/): Viasonix Ltd. is an international one-stop medical device center for multiple vascular and transcranial Doppler medical equipment.
- [Viasonix at MEDICA 2025: A Big Thank You to Our Global Partners](https://viasonix.com/viasonix-at-medica-2025-a-big-thank-you-to-our-global-partners/): Viasonix thanks our many distributors and business partners who visited our booth at MEDICA 2025 in Düsseldorf. Together we showcased the Falcon vascular systems, Dolphin TCD solutions, and exciting new products including LiteWalk, VDop, and Falcon/Lite - setting the stage for an even stronger 2026.
- [Beyond All Expectations – 2024 is By Far the Best Financial Year Ever Reported by Viasonix](https://viasonix.com/2024-best-financial-year-ever-viasonix/): Viasonix Ltd. is an international one-stop medical device center for multiple vascular and transcranial Doppler medical equipment.
- [Viasonix Achieves FDA Clearance for Falcon/Xpress: A Game-Changer in Vascular Diagnostics](https://viasonix.com/viasonix-achieves-fda-clearance-for-falcon-xpress/): The Falcon/Xpress, now available in the USA, brings high-end ABI/TBI vascular diagnostic performance to mid-range markets at an affordable price.
- [Viasonix Announces CE MDR Approval for the New Falcon/Xpress Vascular System!](https://viasonix.com/ce-mdr-approval-for-falcon-xpress/): The Falcon/Xpress, the latest addition to the renowned Falcon family, has received CE MDR approval, making it ready for launch across Europe. This cutting-edge vascular diagnostic system combines numerous clinical capabilities with affordability, without compromising on performance.
- [Viasonix Celebrates Overwhelming Success at the Medica 2024 Exhibition](https://viasonix.com/viasonix-celebrates-overwhelming-success-medica-2024-exhibition/): Medica 2024 was a major success for Viasonix, featuring the launch of the affordable Falcon/Xpress system and live demos of the advanced Dolphin/XF TCD robot.
- [The Critical Role of Bilateral Brachial Pressure Measurements](https://viasonix.com/critical-role-of-bilateral-brachial-pressure/): The importance of bilateral brachial pressure measurements is highlighted in a recent study utilizing the Viasonix Falcon system, revealing crucial insights for accurate vascular diagnosis and effective management of conditions such as Subclavian Steal Syndrome.
- [Viasonix, líder global na fabricação de equipamentos vasculares e de TCD, marca 2023 como mais um ano recorde](https://viasonix.com/viasonix-lider-global-na-fabricacao-de-equipamentos-vasculares-e-de-tcd-marca-2023-como-mais-um-ano-recorde/): Viasonix Ltd. é um centro estabelecido de sistemas médicos de Doppler vascular e transcraniano.
- [Viasonix, a Global Manufacturing Leader of TCD and Vascular Equipment, Marks 2023 as Yet Another Record Year](https://viasonix.com/viasonix-marks-2023-as-yet-another-record-year/): Viasonix Ltd. is an established hub for vascular and transcranial Doppler medical systems.
- [Review of the Evolution of Transcranial Doppler Robotics](https://viasonix.com/evolution-of-transcranial-doppler-robotics/): Explore the recent advancements in Transcranial Doppler (TCD) technology with our in-depth review of robotic TCD systems. Discover how these innovations enhance brain care and diagnosis, and the role of the Viasonix TCD robot in this field.
- [FAQ about the TCD PFO Bubble Test](https://viasonix.com/faq-tcd-pfo-bubble-study-test/): PFO is a standard and common test designed to identify a right-to-left shunt defect in the heart. 
- [8 accesorios esenciales para un equipo fisiológico vascular completo](https://viasonix.com/8-accesorios-esenciales-para-un-equipo-fisiologico-vascular-completo/): Descubra la diferencia que pueden marcar los accesorios de alta calidad a la hora de mejorar el diagnóstico vascular. Mejore sus diagnósticos vasculares con Falcon/PRO, que combina tecnología de primer nivel y un diseño fácil de usar.
- [8 Essential Accessories for a Complete Vascular Physiologic Setup](https://viasonix.com/8-essential-accessories-for-a-complete-vascular-physiologic-setup/): Discover the difference high-quality accessories can make in enhancing vascular diagnosis. Elevate your vascular diagnostics with Falcon/PRO, combining top-tier technology and user-friendly design.
- [Automated ABPI Devices: A Step Forward or a Misstep in PAD Diagnosis?](https://viasonix.com/automated-abpi-devices-for-pad-diagnosis/): The stakes are high when diagnosing PAD. Automated ABPI devices might seem appealing, but the risks of misdiagnosis can't be ignored.
- [Viasonix Dolphin TCD & ICM+ Integration: Empowering Cerebrovascular Management](https://viasonix.com/dolphin-tcd-and-icm-integration/): The integration of Viasonix Dolphin TCD with ICM+ application software enables continuous monitoring of cerebral autoregulation indices, providing healthcare professionals with valuable insights into various cerebrovascular conditions and improving patient care.
- [Another Record Year for Viasonix TCD and PAD Equipment Manufacturer](https://viasonix.com/another-record-year-viasonix-tcd-pad-equipment-manufacturer/): Viasonix Ltd. is an established global medical device leader for Transcranial Doppler and Vascular Physiologic machines.
- [Viasonix Awarded CE MDR Certification for its Vascular and TCD Products](https://viasonix.com/viasonix-awarded-ce-mdr-certification-vascular-tcd-products/): Viasonix Ltd., a leading medical device company specializing in the development and sale of innovative and cutting-edge vascular and transcranial Doppler technologies, is proud to announce that it has successfully renewed its MDD CE certification with the new European MDR CE certification process.
- [Huge Success and Impact of the Dolphin TCD at the Thai Stroke Society Annual Meeting 2023](https://viasonix.com/huge-success-of-dolphin-tcd-at-thai-stroke-meeting-in-2023/): The Thai Stroke Society Annual Meeting 2023 was a huge success for Viasonix and our longtime business partner, MD HealthCare.
- [Dolphin Transcranial Doppler Competitor Advertises that Viasonix Technology is Superior](https://viasonix.com/dolphin-tcd-competitor-advertises-viasonix-technology-as-superior/): While market feedback to the advanced Viasonix Dolphin TCD machines is overwhelmingly positive, you may find it interesting that even our direct competitor advertises that the Viasonix technology is superior.
- [Physiological Vascular Testing is a Standard Reimbursable Procedure](https://viasonix.com/physiological-vascular-testing-standard-reimbursable-procedure/): In the USA, vascular physiologic diagnosis is reimbursed under 3 different CPT codes
- [Transcranial Doppler is a Standard Reimbursable Procedure](https://viasonix.com/transcranial-doppler-is-a-standard-reimbursable-procedure/): Transcranial Doppler is a medical test performed with growing popularity in clinical practice. It is a non-invasive, accurate, and low-cost technique that is widely used for a variety of clinical applications, and it is also reimbursable.
- [FAQ about ABI Stress Test](https://viasonix.com/faq-about-abi-stress-test/): The ABI Stress Test is a physiological test designed to identify the severity of a lower limb pathology.
- [Image Monitoring USA Awarded Top 10 Company for Providing Medical Imaging Solutions](https://viasonix.com/image-monitoring-usa-awarded-top-10-company-for-providing-medical-imaging-solutions/): Image Monitoring USA is the exclusive distributor of the advanced Falcon physiologic ABI machines and the Dolphin Transcranial Doppler systems
- [FAQ about ABI Machines](https://viasonix.com/faq-about-abi-machines/): ABI Machine is an instrument designed to perform the vascular physiological assessment in patients to identify vascular problems in the legs.
- [FAQ about Pulse Volume Recording (PVR)](https://viasonix.com/faq-about-pulse-volume-recording-pvr/): PVR is a standard and common physiological test designed to identify vascular problems in the lower limbs of patients.
- [FAQ about Ankle-Brachial Index (ABI)](https://viasonix.com/faq/ankle-brachial-index-abi/): In this session, we will try to discuss frequently asked questions about the Ankle Brachial Index test (ABI). ABI is a standard test performed as part of the physiologic evaluation of patients with a suspected peripheral vascular disorder.
- [Dolphin/XF TCD Robot Makes a Huge Impact at a Stroke Meeting](https://viasonix.com/dolphin-xf-tcd-robot-makes-a-huge-impact-at-a-stroke-meeting/): Image Monitoring USA presents the Dolphin TCD Machine at the Annual International Stroke Conference 2022 Held in New Orleans
- [Record Year for Viasonix Transcranial Doppler and Physiologic Equipment Manufacturer](https://viasonix.com/record-year-for-viasonix-transcranial-doppler-and-physiologic-equipment-manufacturer/): Viasonix Ltd. establishes itself as a global TCD and vascular diagnostics leader
- [The Advantages of TCD over TCCD (Color Doppler)](https://viasonix.com/the-advantages-of-tcd-over-tccd-color-doppler/): Why use a transcranial Doppler machine when an ultrasound imaging machine provides presumably similar information and an image of the examined cerebral blood vessel? That's a frequently asked question.
- [The Story of the TCD Breath Holding Protocol](https://viasonix.com/story-of-tcd-breath-holding-protocol/): The development of breath-holding using Transcranial Doppler (TCD) as a vasomotor reactivity diagnosis test protocol
- [An Overview of Physiologic Diagnostic Equipment Market and Manufacturers](https://viasonix.com/physiologic-diagnostic-equipment-market-and-manufacturers/): Overview of active manufacturers of peripheral vascular diagnosis machines, and the technology basis for the physiologic diagnostics equipment
- [The Amazing Falcon TOS Diagnosis Machine](https://viasonix.com/the-amazing-falcon-tos-diagnosis-machine/): New diagnosis technology and user interface features make the Falcon physiologic system the optimal equipment for examinations of Thoracic Outlet Syndrome (TOS).
- [12 Things that Make the Dolphin/XF the Best TCD Robot in the Market](https://viasonix.com/12-things-that-makes-dolphin-xf-the-best-tcd-robot/): We selected 12 of the most interesting features of the Dolphin/XF Transcranial Doppler Robotic probe making it the ideal TCD Headgear solution.
- [Spectral Doppler Analysis is Key in Physiological Testing](https://viasonix.com/spectral-doppler-analysis-in-physiological-testing/): Falcon ABI system provides the best spectral Doppler waveforms. Learn more about the importance of the spectral display.
- [Falcon and Dolphin to be Presented at the Annual SVU Meeting](https://viasonix.com/falcon-and-dolphin-to-be-presented-at-annual-svu-meeting/): Viasonix products to be presented at the upcoming SVU including its Advanced Physiologic ABI Machines and Exciting TCD Systems
- [The History of Transcranial Doppler (TCD) Equipment – Part 2](https://viasonix.com/the-history-of-transcranial-doppler-tcd-equipment-part-2/): If you are looking for a new Transcranial Doppler machine, take a look at this two-part history review of how the TCD technology started and the global impact it had over the last 4 decades.
- [The History of Transcranial Doppler (TCD) Equipment – Part 1](https://viasonix.com/history-of-tcd-equipment-part-1/): If you are looking for a new Transcranial Doppler machine, take a look at this two-part history review of how the TCD technology started and the global impact it had over the last 4 decades.
- [For the first time, an FDA-cleared robotic probe can assist users in fast and simple bilateral brain flow scanning](https://viasonix.com/fda-cleared-robotic-probe-assists-users-in-bilateral-brain-flow-scanning/): Viasonix receives FDA approval for Dolphin/XF, launches international sales of breakthrough Transcranial Doppler Robot
- [Peripheral Vascular Diagnostic Devices Complement Ultrasound Imaging](https://viasonix.com/peripheral-vascular-diagnostic-devices-complement-ultrasound-imaging/): Peripheral Vascular Diagnosis devices, also known as ABI machines or Physiologic systems, are complementary to ultrasound imaging systems for appropriate clinical diagnosis.
- [TCD is an Essential Diagnostic Tool for Covid-19 Patients](https://viasonix.com/tcd-is-an-essential-diagnostic-tool-for-covid-19-patients/): Coronavirus has a detrimental effect on the vascular circulation, and Transcranial Doppler plays a key clinical diagnostic role.
- [Viasonix Launches the Dolphin/MAX, the Only High-End Battery Operated Stand-Alone System](https://viasonix.com/viasonix-launches-dolphin-max-high-end-battery-operated-tcd/): The Viasonix team does it again, pioneering the development of a high-end integrated stand-alone TCD system that also includes an integrated rechargeable battery.
- [Viasonix Vigorously and Continuously Expands International Exposure](https://viasonix.com/viasonix-vigorously-and-continuously-expands-international-exposure/): Viasonix, a dynamic medical device company focused on vascular and Transcranial Doppler diagnostic devices, continuously expands its international distribution network and market exposure
- [Dolphin TCD Emerges as the Natural Successor to the Sonara TCD](https://viasonix.com/dolphin-tcd-emerges-as-the-natural-successor-to-the-sonara-tcd/): The Dolphin and Sonara Transcranial Doppler systems were developed by the same Viasonix R&D team. With the Sonara TCD systems reaching their end of life in the market, the Dolphin becomes the natural next generation TCD system.

## Pages
- [Selected Falcon PAD Published Clinical Studies](https://viasonix.com/falcon-published-clinical-studies/): Explore peer-reviewed articles, reviews, and clinical publications that reference Falcon technology across ABI / TBI / PVR / Doppler and other related research applications.
- [Selected Dolphin TCD Published Clinical Studies](https://viasonix.com/dolphin-published-clinical-studies/): Explore peer-reviewed articles, reviews, and clinical publications that reference Dolphin technology across cerebrovascular monitoring, robotic ultrasound, and related research applications.
- [Falcon/Xpress](https://viasonix.com/products/vascular-physiologic/falcon-xpress/): Falcon/QUAD
- [Intraoperative TCD Monitoring](https://viasonix.com/neurology-neurosurgery/intraoperative-tcd-monitoring/): Intraoperative TCD monitoring is primarily focused on ensuring that blood flow to the brain is not impaired or stopped during the operation. Sharp changes in velocity can suggest equivalent changes in volume blood flow, which may put the brain at high risk. Of particular interest are abnormal low flow rates to the brain.
- [Intraoperative Doppler](https://viasonix.com/neurology-neurosurgery/intraoperative-doppler-measurements/): Intraoperative Doppler measurements are used primarily to verify appropriate blood flow in the vessel or graft of interest and the direction of that blood flow.
- [Alternative to Sonara TCD](https://viasonix.com/alternative-to-sonara-tcd/): We are now seeing many existing TCD users looking for an alternative to Sonara. Several TCD technologists told us that it is difficult to find replacement parts for Sonara.  
- [COVID-19](https://viasonix.com/neurology-neurosurgery/covid-19/): Covid-19, also called Coronavirus, is a newly identified virus that causes contagious disease. The Coronavirus led to a worldwide pandemic with respiratory illness and cerebrovascular diseases.
- [Endarterectomy](https://viasonix.com/neurology-neurosurgery/endarterectomy/): Carotid Endarterectomy (CEA) is a surgical procedure designed to remove plaque in the Carotid artery by separating it from the carotid arterial wall. Thus, carotid arterial constriction, which may cause a decrease in cerebral perfusion as well as a potential source for cerebral emboli, is removed.
- [Stroke Management](https://viasonix.com/neurology-neurosurgery/stroke-management/): Stroke is the result of the death of brain cells due to lack of cerebral perfusion, which in turn causes serious functionality problems that may even lead to death.
- [Dolphin/XF Robotic Probe](https://viasonix.com/products/transcranial-doppler/dolphin-xf-robotic-probe/): The Dolphin/XF is a new breakthrough development in TCD robotics. It is designed to assist the user in quickly and automatically insonating and monitoring cerebral blood flow.
- [Pulse Wave Velocity](https://viasonix.com/vascular-angiology/pulse-wave-velocity-pwv/): Pulse Wave Velocity (PWV) is a simple and non-invasive measurement, which can be measured at various locations along with the arterial circulation to assess arterial stiffness. 
- [LiteWalk](https://viasonix.com/products/home-care/litewalk/): LiteWalk is a physiological medical device that mimics walking for populations with limited mobility, supporting local blood flow circulation and preventing venous stasis.
- [Toe Brachial Index (TBI)](https://viasonix.com/vascular-angiology/toe-brachial-index-tbi/): The Toe Brachial Index (TBI) is defined as the ratio between the systolic blood pressure in the right or left toe and the higher of the systolic pressure in the right or left arms.
- [Dolphin/IQ](https://viasonix.com/products/transcranial-doppler/dolphin-iq/): All of the advantages and performance of the cutting-edge Dolphin TCD technology for measurements of cerebral blood flow velocities are implemented in the smart and compact Dolphin/IQ Transcranial Doppler module.
- [Dolphin/4D](https://viasonix.com/products/transcranial-doppler/dolphin-4d/): The cutting-edge technology of the standalone Dolphin/4D transcranial Doppler system is the optimal TCD solution for measurements of cerebral blood flow velocities.
- [Dolphin/MAX](https://viasonix.com/products/transcranial-doppler/dolphin-max/): Transcranial Doppler machine with an integrated rechargeable battery. The Dolphin/MAX is the ideal portable TCD system for measurements of cerebral blood flow in Neurology, ICU, and Neurosurgery settings
- [Falcon/ABI+](https://viasonix.com/products/vascular-physiologic/falcon-abi/): Falcon/ABI+
- [Falcon/QUAD](https://viasonix.com/products/vascular-physiologic/falcon-quad/): Falcon/QUAD
- [Falcon/PRO](https://viasonix.com/products/vascular-physiologic/falcon-pro/): Falcon/PRO
- [Transcranial Doppler](https://viasonix.com/products/transcranial-doppler/): Select the Transcranial Doppler model that best meets your needs!
- [Vascular / Physiologic](https://viasonix.com/products/vascular-physiologic/): Select the model that best meets your needs!
- [Breath Holding](https://viasonix.com/neurology-neurosurgery/breath-holding/): The Breath Holding (BH) test is a specific test for evaluation of Vasomotor Reactivity (VMR) and cerebral autoregulatory capacity.
- [Evaluation Of ICP Changes](https://viasonix.com/neurology-neurosurgery/evaluation-of-icp-changes/): Intracranial Pressure (ICP) is the pressure inside the skull, which has a direct effect on the blood perfusion of the brain.
- [Emboli Detection](https://viasonix.com/neurology-neurosurgery/emboli-detection/): The most common cerebral artery that is monitored during emboli detection is the Middle Cerebral Artery (MCA). Specifically, Bilateral monitoring requires obtaining signals from both the right and left MCAs.
- [Sickle Cell Disease](https://viasonix.com/neurology-neurosurgery/sickle-cell-disease/): Sickle Cell Disease (SCD) is a hereditary disorder of the blood caused by abnormal form of hemoglobin, which causes distorted (sickled) red blood cells. It is associated with a high risk of stroke, particularly in the early years of childhood.
- [Patent Foramen Ovale (PFO)](https://viasonix.com/neurology-neurosurgery/patent-foramen-ovale-pfo/): PFO is a hole between the left and right atriums of the heart, which creates a right to left shunt for blood flow. This hole typically exists before birth, but it most often closes shortly after birth. If the hole fails to close naturally after birth, it is referred to as a Patent Foramen Ovale (PFO).
- [Cerebral Monitoring](https://viasonix.com/neurology-neurosurgery/monitoring/): Cerebral monitoring using 2 MHz Transcranial Doppler sonography is the short- or long-term TCD monitoring of blood flow in one of the blood vessels comprising the Circle of Willis, typically the MCA (Middle Cerebral Artery).
- [Collateral Capacity](https://viasonix.com/neurology-neurosurgery/collateral-capacity/): Similar to cerebral autoregulation and vasomotor reactivity, cerebral collateral flow reflects an alternative compensatory mechanism to pathological flow conditions
- [Intracranial Stenosis](https://viasonix.com/neurology-neurosurgery/intracranial-stenosis/): Intracranial Stenosis is a narrowing of a cerebral artery, which can develop primarily due to intracranial atherosclerosis or acute thrombus. It is a significant risk factor for Transient Ischemic Attack (TIA) and ultimately a Stroke.
- [VMR and Autoregulation](https://viasonix.com/neurology-neurosurgery/vmr-and-autoregulation/): Vasomotor reactivity (VMR) and autoregulation define the physiological compensatory mechanisms when flow is impaired. Identification of exhausted VMR can be a good indication for high risk for stroke.
- [Brain Death](https://viasonix.com/neurology-neurosurgery/brain-death/): Brain Death, or Cerebral Circulatory Arrest, is the irreversible complete loss of brain function. This condition of brain damage is characterized by almost no volume blood flow to the brain and very high distal resistance to arterial flow.
- [Arteriovenous Malformation](https://viasonix.com/neurology-neurosurgery/arteriovenous-malformation/): Arteriovenous Malformation (AVM) relates to an anomaly whereby the arterial flow bypasses the capillary circulation and connects directly to the venous drainage circulation, thus not allowing for appropriate tissue perfusion.
- [Vasospasm and SAH](https://viasonix.com/neurology-neurosurgery/vasospasm-and-sah/): Cerebral Vasospasm is one of the major complications after Subarachnoid Hemorrhage (SAH) as a result of an aneurysm rupture or head injury. The outcome of vasospasm is the reduction of the arterial cross-sectional area due to extended arterial vasoconstriction or external mechanical forces.
- [Air Plethysmography](https://viasonix.com/vascular-angiology/air-plethysmography/): The Air Plethysmography (APG) test relates to the use of a pressure cuff as a sensor. The pressure cuff is inflated to low pressure, such as around 20 mmHg for lymphatic occlusion or around 60 mmHg for venous occlusion, and then the air displacement is used to measure blood volume changes at the measuring site.
- [Extracranial Examination](https://viasonix.com/vascular-angiology/extracranial-examination/): Extracranial Doppler examinations are measurements of blood flow velocities in the extracranial vessels, and particularly the Common, External, and Internal Carotid arteries, as well as the Subclavian artery. These measurements are key in the diagnosis of cerebral pathology and circulation.
- [Penile Function](https://viasonix.com/vascular-angiology/penile-function/): Penile function or impotence test is used for determination of whether penile function disorders such as Erectile Dysfunction (ED) are of vascular or vasculogenic nature. Several causes may be responsible for Erectile Dysfunction. The main causes of erectile failure include vasculogenic, neurogenic, hormonal, and psychological factors. 
- [Palmar Arch Test and AV Fistula](https://viasonix.com/vascular-angiology/palmar-arch-test-and-av-fistula/): The Palmar Arch Test (PAT), also known as Allen’s Test, is a specialty test performed to evaluate the patency of the arteries in the hand prior to radial or ulnar artery harvesting in artery bypass procedures or before the surgical creation of an upper extremity hemodialysis fistula or graft.
- [Reactive Hyperemia](https://viasonix.com/vascular-angiology/reactive-hyperemia/): In special cases, the reactive hyperemia test (RH) can replace the standard exercise tests and induce vascular stress.
- [Maximum Venous Outflow / Segmental Venous Capacitance (MVO/SVC)](https://viasonix.com/vascular-angiology/maximum-venous-outflow-segmental-venous-capacitance-mvo-svc/): The MVO/SVC test (Maximal Venous Outflow / Segmental Venous Capacitance) is a specific functional physiological lower limb venous test that helps diagnose obstructions to the venous circulation in the legs.
- [Raynaud’s Syndrome](https://viasonix.com/vascular-angiology/raynauds-syndrome/): The terms "Raynaud's syndrome," "Raynaud's disease," "Raynaud's phenomenon," and "Raynaud's disorder" are often used interchangeably.
- [Exercise Stress Test](https://viasonix.com/vascular-angiology/exercise-stress-test/): The purpose of the exercise testing is to increase the blood flow in the legs, which in turn may result in a more considerable pressure drop distal to an arterial lesion or obstruction to flow. In this situation, the ABI (Ankle Brachial Index) will decrease post-stress testing compared to the ABI value at rest.  
- [Venous Reflux](https://viasonix.com/vascular-angiology/venous-reflux/): The Venous Reflux test is used to determine the competence of the superficial venous valves in the calves of the legs. This test is performed with a DC PPG sensor.
- [Thoracic Outlet Syndrome](https://viasonix.com/vascular-angiology/thoracic-outlet-syndrome/): The Thoracic Outlet Syndrome test (TOS) is an examination performed primarily to discriminate between the causes of patient symptoms due to compression at the thoracic outlet. The compression can affect the blood vessels or nerves, and the TOS test is conducted to determine whether the patient symptoms originate from vascular or neurogenic causes.
- [Photo-Plethysmography Readings](https://viasonix.com/vascular-angiology/photo-plethysmography-readings/): Photo-plethysmography (PPG) is a non-invasive testing method and is an essential tool in every physiological vascular testing examination.
- [Doppler Measurements](https://viasonix.com/vascular-angiology/doppler-measurements/): Doppler measurements of the peripheral arteries, particularly those in the legs, are an important qualitative diagnostic method to determine arterial vascular elasticity as part of a complete Peripheral Arterial Disease (PAD) diagnosis.
- [Pulse Volume Recording](https://viasonix.com/vascular-angiology/pulse-volume-recording/): Pulse Volume Recording (PVR) is a pneumo-plethysmography test that is widely used for non-invasive diagnosis of lower extremity peripheral arterial disease (PAD).   
- [Ankle Brachial Index (ABI)](https://viasonix.com/vascular-angiology/ankle-brachial-index-abi/): The Ankle Brachial Index is a standard and common method of physiologic assessment of vascular pathology in the lower limbs in a fast and simple manner (1, 2, 3).
- [Segmental Blood Pressures](https://viasonix.com/vascular-angiology/segmental-blood-pressures/): Lower extremity Segmental Blood Pressures (SBP) diagnosis refers to the measurement of the systolic blood pressure at various sites along each leg.
- [Neurology / Neurosurgery](https://viasonix.com/neurology-neurosurgery/): COVID-19
- [Vascular / Angiology](https://viasonix.com/vascular-angiology/): Segmental Blood Pressure
- [Distributors](https://viasonix.com/distributors/): Authorized distributors for Falcon vascular and Dolphin transcranial Doppler systems. Tell us where you are and we will connect you with the right local partner for sales, demos, training, and service.
- [Contact](https://viasonix.com/contact/): Our company is dedicated to supporting the international vascular markets with a wide range of advanced medical products
- [News](https://viasonix.com/news/): Stay up to date with our latest news and events.
- [Gallery](https://viasonix.com/gallery/): All Dolphin Falcon Falcon Video Dolphin Wireless Remote Control Dolphin Wired Remote Control Dolphin Optional Stand Dolphin Monitoring Headset Dolphin Footswitch Dolphin External Channels Connection Box Dolphin 16 MHz Intraoperative Probe Dolphin 8 MHz Probe Dolphin 4 MHz Probe Dolphin 2 MHz Probe Dolphin 2 MHz Monitoring Probe Dolphin 1.6 MHz Probe Falcon Wireless Remote Control Falcon Wired Remote Control Temperature Sensor PPG Adhesive Stickers Falcon Doppler Probes Disc PPG Sensors 10 Tube Distributor 10 Tube Assembly
- [Clinical](https://viasonix.com/clinical/): Segmental Blood Pressures
- [Products](https://viasonix.com/products/): Our Divisions
- [About Us](https://viasonix.com/about-us/): Welcome to Viasonix, a renowned medical device manufacturer specializing in high-end vascular physiologic systems, transcranial doppler equipment, and home care devices.
- [Privacy Policy](https://viasonix.com/privacy/): This privacy policy will explain how our organization uses the personal data we collect from you when you use our website.
- [Home](https://viasonix.com/): Viasonix is home to a wide range of advanced vascular diagnosis and home care products.