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. A small amount of air within the glass envelope is beneficial because it helps to dissipate heat. False True 2. The volume and density of calcium measured in the coronary arteries on MDCT examination are quantified with use of a value called the Agatston score Euler constant Housfield number Lambert-Beer value 3. The main advantage of a charged-soupled 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 less sensitive to mechanical stresses It is generally much smaller 4. A radiograph is synonymous with an x-ray True False 5. 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 An array of thin-film transtors (TFT's) A vidicon television camera tube An array of photodiodes A series of quantum detectors 6. The two principle advantages that digital fluoroscopy (DF) has over image intensified fluoroscopy (IIF) are An improved ability to eliminate patient motion and reduce patient exposures A higher speed of spot image acquisition and the ability to post process the image Images with long scale contrast and higher spatial resolution A lower contrast detectability and a reduced noise level 7. The order of imaging methods (from worst to best) with respect to visibility of detail (resolution) is Gamma camera, fluoroscopy, CT. Radiography, fluoroscopy, MRI. Ultrasound, fluoroscopy, radiography. Gamma camera, fluoroscopy, MRI. 8. A digital technique which eliminates the majority of non-vascular structures by enhancement of the sacular structures is best termed: Digital subtraction angiography (DSA) Photostimulable subtraction radiography (PSR) Teleradiography (TR) Scanned projection radiography (SPR) 9. 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) Percentage washout value (PWV) Mean transit time (MTT) 10. What is the upper limit of exposure that an occupationally exposed individual may receive according to state and federal regulations? 100 rem/year 0.05 Sv/year 0.005 Sv/yea 0.5 Sv/year 11. What is the thickness of the lead-lined rubber lining protective apparel in veterinary radiography? 5 mm 1 cm 10 mm 0.5 mm 12. The vidicon and plumbicon are the most commonly employed ______for a modern radiography department Fluoroscopic xray tubes Cinefluoroscopic tubes Television camera tubes Image intensifier tubes 13. X-rays were discovered by Wilhelm Conrad Roentgen in the year _____ 1865 1921 1895 1945 14. In order to maintain image clarity, the path of electron flow from photocathode to output phosphor in the image intensification tube is controlled by The vacuum glass envelope The accelerating anode Electrostatic lenses The input phosphor 15. In order to accommodate human eye integration time, each frame of a television image must be presented in less than 1 second 1/10 second 1/2 second 1/30 second 16. A focused, thin section axial CT acquisition through just the regionof the vocal cords should extend From the cricoid cartilage inferiorly through sternoclavicular joint From above the hyoid bone inferiorly through the cricoid cartilage From hard palate inferiorly to the hyoid bone From external auditory to the mandible 17. Speed of ultrasound depends on? wavelength medium material amplitude 18. The degenerative pathologic process involving the forward slipping of an upper vertebral body over a lower vertebral body is called Spondylolysis Herniated nucleus pulposus Spinal stenosis Spondylolisthesis 19. Digital imaging in radiography is the general term used to describe a number of techniques that can be used to enable the digital acquisition of the information contained in the radiation beam after it exits the patient. All of the following terms are used to describe these processes EXCEPT? Indirect electronic radiography (IER) Computed radiography (CR) Digital fluoroscopy (DF) Direct-to-digital radiography (DDR) 20. The reduction of brightness at the periphery of image display of an image intensified fluoroscpoe is termed Dimunition Lateral dispersion Vignetting Modulation transfer 21. Which of the following are limitations of the stationary anode? The target is made of tungsten. It is unable to withstand large amounts of heat. If the target becomes pitted, radiographs appear darker. It is limited to a larger focal spot to accomodate higher temperatures. 22. ____releases electrons when struck by light photons and _____releases electrons when struck by x-ray photons Silverbromide, zinc lead sulfide Gadolinium oxysulfide, cesium iodide Amorphous silicon, amorphous selenium Amorphous selenium, amorphous silicon 23. The time it takes for the human eye to adjust to adjust to the low light levels of conventional fluoroscopy is called Adaption time Interlace time Integration time Flicker timer 24. Accurate demonstration of --------------------would most likely required the intravenous injection of an iodinated contrast agent during a CT study of the chest Pneumonia Plumonary nodule Mediastinal lymphadenopathy Bronchiectasis 25. Which of the following statements is true? X-rays with longer wavelengths penetrate farther than x-rays with shorter wavelengths. X-rays with shorter wavelengths penetrate farther than x-rays with longer wavelengths. Gamma rays are required for the production of a radiograph Electromagnetic radiation with lower frequency has more penetrating power through space and matter. 1 out of 25 Time is Up! Time's up
