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. Simple cysts of the kidney have average attenuation values in the range of 30 to 50 HU Above 60 HU -40 to 0 HU 0 to 20 HU 2. Which of the follwoing sets of section width and spacing would be most suitable for a general survey CT oe neck? 3 mm thick every 3 mm 3 mm thick every 5 mm 0.75 mm thick every 0.75 mm 10 mm thick every 10 mm 3. The release of trapped energy in a meta-stable F center (Europium electron holes) of a BaFBr (Barium fluorobromide)crystal in the photostimulable phosphor imaging plate (PSP) of a CR imaging system are triggered by the exposure to teh visible (laser) light in the Ultraviolet spectrum Blue-violet spectrum Green spectrum Red spectrum 4. Which of the following phases of renal contrast enhancement best demonstrates transitional cell carcinoma (TCC) of the bladder? Nephrographic Early arterial Corticomedullary Excretory 5. A substantial increase in conventional fluoroscopic brightness levels is accomplished in most modern systems using a(an) Television system Image intensifier Video tape unit Magnification technique 6. X-rays were discovered by Wilhelm Conrad Roentgen in the year _____ 1921 1895 1865 1945 7. Which of the following are limitations of the stationary anode? The target is made of tungsten. If the target becomes pitted, radiographs appear darker. It is limited to a larger focal spot to accomodate higher temperatures. It is unable to withstand large amounts of heat. 8. Veterinary patients have a tendency to move while being positioned for radiographs to be taken. The radiographer should help to safely prevent artifacts of movement by Selecting a longer exposure time than is recommended. Altering the direction in which x-rays move. Using the shortest exposure time possible. Sedating all patients before taking radiographs 9. Bowel obstruction due to loss of normal contractile motion in an area of intestine is termed Adhesion Intussusception Ileus Dyspepsia 10. 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, 2, and 3 2 and 3 1 and 3 1 and 2 11. An enterovesical fistula is an abnormal communication between the bowel and the Umbilicus Uterus Vagina Bladder 12. Electrons travel Toward the cathode in an x-ray tube. Toward the anode in an x-ray tube. Within the nucleus of an atom. Away from the anode in an x-ray tube 13. The main advantage of a charged-coupled device (CCD) compared to a television camera tube include all the following EXCEPT It has greater sensitivity at lower light levels It is associated with a reduced contrast resolution or low contrast detectability It is generally much smaller It is less sensitive to mechanical stresses 14. The still viable ischemic cerebral tissue that surrounds the infarct core in a patient with an acute stroke is termed the Thrombolytic zone Strocke volume Hemorrhage focus Ischemic penumbra 15. In x-ray tubes, the majority of energy produced by the movement of electrons is in the form of X-ray energy Sound Light Heat 16. The negatively charged particle of an atom is the Neutron Proton Electron Nucleus 17. 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 noise. Image blurring Visibility of anatomical detail. Image unsharpness. 18. Which of the following is an advantage of digital imaging over conventional imaging Less noise Less exposure time More resolution More exposure latitude 19. Which of the following terms is used to describe a fibroid tumor of the uterus? Cystic teratoma Corpus luteum Endometriosis Leiomyoma 20. The individual picture elements, which contribute to the smallest segment of an image matrix are termed Pixels ROMs Bytes Bits 21. The major factors effecting the amount of brightness gain in an image intensifier are Dispersion and retinal gains Focal and scoptic vision gains Minification ratio and flux gains Adaptation and vignestting gains 22. 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 Spondylolisthesis Spondylolysis 23. For protons, the gyromagnetic ratio has the value 4e8 rads-¹ T-¹ 5e8 rads-¹ T-¹ 3e8 rads-¹ T-¹ 2.68e8 rads-¹ T-¹ 24. The image on a photostrimulable phosphor plate (PSP) of a CR imaging system is not permanent and will fade at a rate of about 25% per hour after the initial exposure 10 % within 8 hours of the exposure 10% per hour after the initial exposure 25 % within 8 hours of the exposure 25. After initiation of rapid bolus administration of an iodinated contrast agent, the arterial phase of hepatic contrast enhancement occurs at aproximately: 120-180 secs 25-35 secs 15-20 secs 60-70 secs 1 out of 25 Time is Up! Time's up