29/03/2020 Medical Imaging(Senior Class Physics Study by Topics) 29/03/2020 0Comments by Gate Academy Welcome to your Medical Imaging(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. During CT perfusion studies, the quantity of blood (in mL) that moves through 100 g of tissue each minute is termed the Cerebral blood volum (CBV) Cerebral blood flow (CBF) Mean transit time (MTT) Percentage washout value (PWV) 2. The volume and density of calcium measured in the coronary arteries on MDCT examination are quantified with use of a value called the Lambert-Beer value Agatston score Housfield number Euler constant 3. At what percentage of overlap should CT sections be reconstructed to improve the quality of multiplannar reformation (MPR) images? 10% 100% 50% 25% 4. Gradual decrease in X-ray beam intensity as it passes through material is called decay attenuation imaging radioactivity 5. The individual picture elements, which contribute to the smallest segment of an image matrix are termed Pixels Bits ROMs Bytes 6. The main advantage of a charged-soupled device (CCD) compared to a television camera tube include all the following EXCEPT It is generally much smaller It has greater sensitivity at lower light levels It is less sensitive to mechanical stresses It is associated with a reduced contrast resolution or low contrast detectability 7. The vidicon and plumbicon are the most commonly employed ______for a modern radiography department Image intensifier tubes Fluoroscopic xray tubes Television camera tubes Cinefluoroscopic tubes 8. The degenerative pathologic process involving the forward slipping of an upper vertebral body over a lower vertebral body is called Spinal stenosis Herniated nucleus pulposus Spondylolysis Spondylolisthesis 9. The total brightness gain for a modern image intensifier fluoroscopic image is about ____greater than a conventional fluoroscopic screen image 20-40 times 50-100 times 5000-30000 times 5-20 times 10. What is the thickness of the lead-lined rubber lining protective apparel in veterinary radiography? 0.5 mm 1 cm 5 mm 10 mm 11. Prior to a CT colongraphy, the patient may undergo a process of bowel cleansing termed Catharsis Hydration Fasting Purgation 12. Imaging systems are often evaluated by measuring their resolution (line pairs/mm). Resolution is a characteristic which is directly related to the following except Image blurring Image noise. Image unsharpness. Visibility of anatomical detail. 13. With either an amorphous selenium or cesium iodide amorphous silicon digital radiographic imaging, the latent image is formed by an electronic signal that is stored by A series of quantum detectors A vidicon television camera tube An array of photodiodes An array of thin-film transtors (TFT's) 14. Which of the following layers are found on the input side of an image intensifier tube?1. incandescent screen 2. fluoroscent screen 3. photocathode 1 and 3 2 and 3 1 and 2 1, 2, and 3 15. The imaging plane that is parallel to the foot's plantar surface is called Coronal plane Oblique axial plane Sagittal plane Axial plane 16. Which of the following terms is used to describe a fibroid tumor of the uterus? Leiomyoma Corpus luteum Cystic teratoma Endometriosis 17. Bundles of energy that travel in a wave are called All of the above Photons None of the above Quanta 18. The major factors effecting the amount of brightness gain in an image intensifier are Minification ratio and flux gains Adaptation and vignestting gains Focal and scoptic vision gains Dispersion and retinal gains 19. The usual range of milliamperage required for an image intensified fluoroscopy is about 25-100 mA 100-600 mA 6-10 mA 1-5 mA 20. X-ray electromagnetic radiation travels in a straight line, the direction of which can be altered False True 21. The spatial resolution of an imaging system is most directly related to Visibility of noisy images. Visibility of large low contrast objects. Visibility of soft tissues. Visibility of anatomical detail. 22. In order to accommodate human eye integration time, each frame of a television image must be presented in less than 1/2 second 1/10 second 1/30 second 1 second 23. The most common material used in the formation of the input phosphor of a modern image intensifier is Zinc cadmium sulfide Barium lead sulfate Cesium iodide Calcium tungstate 24. Which of the following is an advantage of digital imaging over conventional imaging More exposure latitude Less exposure time Less noise More resolution 25. On the electromagnetic spectrum, in relation to visible light, x-rays Have a shorter wavelength. Have a lower frequency Are closer in wavelength to infrared rays than light waves Have a longer wavelength. 1 out of 25 Time is Up! Time's up