Computed Tomographic Angiography in the Diagnosis of Peripheral Arterial Disease
Fig. 61.1 Pitch. Pitch defines the degree of stretch of the helical path of the gantry in spiral CT. A pitch of 1.0 results in contiguous raw data for image…
Errors and Artifacts of Carotid Ultrasound Evaluation
Fig. 17.1 Variability of measurements of PSV by three ICAVL-accredited technologists from an in vitro flow model In a clinical study, the interobserver variability of measurements of PSV from the…
Improving Quality in Noninvasive Testing by Certification and Accreditation
Fig. 1.1 American Registry for Diagnostic Medical Sonography (ARDMS) , incorporated 1975 Registered Vascular Technologists (RVTs) currently number 31,000, the majority of whom are registered in another specialty as well…
Vascular Hemodynamics
Fig. 5.1 (a) Velocity curve (Doppler spectrum) from posterior tibial artery at rest illustrating how flow velocity is high during systole but low or zero during diastole. Notice the steep…
TCD Monitoring During Carotid Artery Stenting
Fig. 16.1 (a) Spencer technologies headgear that is utilized for securing the transcranial Doppler probe for periprocedural imaging. The torque device in the front is for tightening the harness depending…
The Role of Duplex Ultrasound Before, During, and After Endovenous Procedures
Fig. 46.1 CEAP classification system The CEAP clinical classification score can then be more precisely defined by Duplex ultrasound (DU) imaging of the superficial, deep, and perforator veins in the…
Plethysmographic Techniques in the Diagnosis of Venous Disease
Fig. 39.1 Calf venous pressure–volume curve . Pressure in the normal limb is low (A) but is elevated in the limb with acute deep venous thrombosis (A′). Inflating the thigh…
Segmental Doppler Pressures and Doppler Waveform Analysis in Peripheral Vascular Disease of the Lower Extremities
Fig. 22.1 Normal arterial velocity tracing (multiphasic). (a = systolic component; b = early diastolic component; c = late diastolic component) Therefore, there are several types of Doppler velocimetry: 1….
Color Duplex Scanning of Superior Mesenteric and Celiac Artery Stenting
Variable Mean Median SD Min. Max. P value Celiac PSV ≥50 native stenosis ≥50 stenting stenosis 379 447 335 428 149.7 158.4 52 205 880 903 0.0670 Celiac EDV ≥50…
Transcutaneous Oxygen Tension: Principles and Applications
Fig. 55.1 Image demonstrating placement of the sensor over the right foot to measure the tcpO2 skin level TcpO2 monitoring is completely noninvasive and atraumatic. It is recommended that sensor…
