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For all structures except the heart, the images are usually taken using a technique called digital subtraction angiography or DSA. Images in this case are usually taken at 2–3 frames per second, which allows the interventional radiologist to evaluate the flow of the blood through a vessel or vessels. This technique "subtracts" the bones and ...
In 2000, the photos were rescanned at a higher resolution, yielding more than 65 gigabytes. The female cadaver was cut into slices at 0.33-millimeter intervals, resulting in some 40 gigabytes of data. The term "cut" is a bit of a misnomer, yet it is used to describe the process of grinding away the top surface of a specimen at regular intervals ...
Eyedropper tool picks up colors from imported images. Graduated and radial fills with up to 64 colors. Version 5.5: (Mac only release) PDF Import; Accepts Photoshop plug-ins, to control scanners or apply filters to images. Place drawn objects within text blocks so they flow with the text. Export pages or objects as bitmap images. FreeHand 6.0 ...
Schematic view of a flow sensor. An ultrasonic flow meter is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. Using ultrasonic transducers, the flow meter can measure the average velocity along the path of an emitted beam of ultrasound, by averaging the difference in measured transit time between the pulses of ultrasound propagating into and ...
A higher spatial bandwidth is crucial for larger image field of view. A refinement of holographic photoplethysmography, holographic laser Doppler imaging, enables non-invasive blood flow pulse wave monitoring in blood vessels of the retina, choroid, conjunctiva, and iris. [24]
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Blood flow pulse wave in the central retinal artery (red) and vein (blue), measured by laser Doppler holography in the eye fundus of a healthy volunteer. The eye offers a unique opportunity for the non-invasive exploration of cardiovascular diseases. LDI by digital holography can measure blood flow in the retina and choroid. [7]
Transdermal optical imaging, also known as transdermal optical imagery [1] or TOI, is a method of detecting blood flow of the face by measuring hemoglobin concentration using a digital video camera. [2] Because of the translucent property of skin, light can travel beneath the skin and re-emit. [3]