29/03/2020 Medical Imaging(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Medical Imaging(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. X-rays were discovered by Wilhelm Conrad Roentgen in the year _____18951921194518652. 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)Digital fluoroscopy (DF)Computed radiography (CR)Direct-to-digital radiography (DDR)3. The reduction of brightness at the periphery of image display of an image intensified fluoroscpoe is termedVignettingModulation transferDimunitionLateral dispersion4. In order to accommodate human eye integration time, each frame of a television image must be presented in less than1/2 second1/10 second1/30 second1 second5. The usual range of milliamperage required for an image intensified fluoroscopy is about100-600 mA6-10 mA25-100 mA1-5 mA6. The major factors effecting the amount of brightness gain in an image intensifier areMinification ratio and flux gainsDispersion and retinal gainsFocal and scoptic vision gainsAdaptation and vignestting gains7. Which of the following statements is true?X-rays with shorter wavelengths penetrate farther than x-rays with longer wavelengths.Gamma rays are required for the production of a radiographX-rays with longer wavelengths penetrate farther than x-rays with shorter wavelengths.Electromagnetic radiation with lower frequency has more penetrating power through space and matter.8. Which of the following is a type of somatic damage caused by radiation?Gene mutationCataractsSterilityNone of the above9. Simple cysts of the kidney have average attenuation values in the range of0 to 20 HU30 to 50 HUAbove 60 HU-40 to 0 HU10. A digital technique which eliminates the majority of non-vascular structures by enhancement of the sacular structures is best termed:Photostimulable subtraction radiography (PSR)Scanned projection radiography (SPR)Digital subtraction angiography (DSA)Teleradiography (TR)11. ____releases electrons when struck by light photons and _____releases electrons when struck by x-ray photons Amorphous silicon, amorphous seleniumAmorphous selenium, amorphous siliconGadolinium oxysulfide, cesium iodideSilverbromide, zinc lead sulfide12. What is the upper limit of exposure that an occupationally exposed individual may receive according to state and federal regulations?0.005 Sv/yea100 rem/year0.05 Sv/year0.5 Sv/year13. The device that receives the image formation radiation exiting the patient, converts it into light, and then increases the brightness of the light is theImage intensifierTelevision monitorCine cameraSpot film camera14. Which of the following pathologic processes may be considered an interstitial disease of the lung?Mediastinal lymphadenopathyBronchogenic carcinomaPulmonary metastasisBronchiectasis15. The electronic image formed on the surface of the photocathode will be converted into____by the output phosphor of the image intensifierVideo signalLaser imageDigital matrixVisible light image16. Filaments located in an x-ray tubeAre found in the anode.Emit electrons when heated.Must have a low melting point and low atomic number.Are made of molybdenum.17. Bowel obstruction due to loss of normal contractile motion in an area of intestine is termedIleusIntussusceptionDyspepsiaAdhesion18. Diffuse fatty inflitration of the hepatic parenchyma may be referred to asChromatosisCirrhosisLipomatosisSteatosis19. The third ventricle of the brain communicates with the fourth ventricle through theAnterior commissureCerebral aqueductFornixSeptum pellucidum20. Energy passing through unit area isintensity of xrayamplitude of xraywavelength of xrayfrequency of xray21. An enterovesical fistula is an abnormal communication between the bowel and theUterusBladderVaginaUmbilicus22. The presence of noise in a medical image will generallyProduce image distortion.Reduce visibility of low contrast objects.Produce artifacts.Produce blurring. 23. Which of the following terms is used to describe a fibroid tumor of the uterus?EndometriosisLeiomyomaCorpus luteumCystic teratoma24. Which of the following are limitations of the stationary anode?If the target becomes pitted, radiographs appear darker.It is limited to a larger focal spot to accomodate higher temperatures.The target is made of tungsten.It is unable to withstand large amounts of heat.25. In order to accommodate human eye integration time, each frame of a television image must be presented in less than1/10 second1/2 second1/30 second1 second26 out of 25Time is Up! Time's up
