LMRT Test With Complete Solution

spatial resolution is improved when - Answer SID increases the adoption of a DICOM standard in the medical imaging industry was designed to - Answer allow various vendors to share digital data with out proprietary software constrains. Most AECS utilize ___ ion chambers in various combinations. - Answer Three Shape distortion is caused by ? A. as the ratio of SID and SOD B.using the tube angle and OID C.automatically in the computer post processing - Answer none of the above Filament materials are chosen primarily for their - Answer high melting points to view the human body in the three dimensions , at least _ images is /are required - Answer two Large patients receive a greater exposure than small patients because their A.SOD is decreased B.OID is increased C.entrance skin surface is closer to the source - Answer all of the above leakage radiation from the lead-lined housing must not exceed - Answer 100mR/hr measured at 1 meter Immediately after exposure and before a digitally acquired image is post-processed , the initial image shown - Answer very low contrast the single most important factor in efficient silver recovery is the - Answer fixer dwell time ionization chamber work on the principle that when radiation interacts with the electrons in air , _ are produced - Answer ion pairs A CR imaging plate that has been grossly overexposed can demonstrate _ if the erasure process is incomplete - Answer ghosting the build-up of tungsten deposits on the inside of an aged X-ray tube adds to the - Answer inherent filtration the greatest factor in the production of scatter radiation is - Answer patient thickness Performing a routine chest radiograph in the AP projection will - Answer produce improved resolution of the thoracic spine Compton scattering occurs when an incident x-ray photon interacts with an _ electron - Answer outer shell electron with low binging energy and high kinetic energy Neon lights illustrate the fact that electrons will flow - Answer in a gaseous environment all of the following are true of induction motors except A.they use multiphase current and can turn at varying rpm. B.motor power can be regulated by the characteristics of the electromagnets that make up the stator. C.Their design is inherently weak with regard to power D.They are used to spin the X-ray tube anode disk - Answer C convert 540.7 to scientific notation - Answer 540.7 x 10-2 American generators operate at - Answer 60 Hz Driving the thermionic cloud from the cathode to the anode requires? - Answer a small amperage extreme overexposure to a DR detector can result in - Answer detector DEL saturation which of the following interactions has a significant impact on the x-ray image A.photoelectric absorption B.coherent scatter C.pair production D.photodisintegration - Answer A. Photoelectric absorption what would be inconsistent with the "scope of practice" of the radiographer? - Answer identify a pneumonia on a chest radiograph for a ER physician. shape distortion can be a result of a patients body habitus ? - Answer True In a vacuum , electromagnetic radiation - Answer has a velocity equal to the speed of light A radiographer can best reduce the amount of scatter radiation from reaching the receptor by A. collimating B.beam restriction C.utilizing a grid - Answer all of the above which of the following radiographic procedures delivers the lowest entrance skin exposure ESE hip pelvis L spine or elbow - Answer Elbow in the x-ray circuit the mA control is found between the - Answer incoming line and the step-down transformer The anode heel effect is more pronounced with? - Answer A 10 degree target angle Most modern AEC systems provide a minimum response time of 1 millisecond 0.001 sec 1/1000 sec - Answer all of the above All of the following are considered man-made sources of radiation exposure except ? A. radiopharmaceuticals B. radon gas exposure in new home construction C.traveling across the country in a commercial air craft D. occupational exposure of medical imaging personnel - Answer B. Radon gas exposure in a new home construction indirect DR uses ___ as the photoconductor material - Answer Amorphous silicon the atomic number is the number of ___ contained in the nucleus - Answer protons a radiograph with few shades of gray exhibits - Answer high contrast a potter-bucks diaphragm must move the grid in a direction that is____ to the direction of the grid lines - Answer perpendicular Which can negatively impact recorded detail? - Answer involuntary motion in a radiology department that is consistent with ALARA guidelines A. EI#s and DI# cannot be used interchangeably B.target EI# for all exams will be established C.EI#s and DI# are used as benchmarks of image quality D.All of the above - Answer All of the above Using digital detector technologies with flat screen displays , image quality acceptance is generally determined by its - Answer quantum noise levels procedural issues such as positioning In air, alpha particles can travel - Answer 5 cm which of the following sets of exposure factors would best control involuntary motion? - Answer 500 mA , 18 ms when choosing between two radiographic grids , the K factor is different. choosing a grid with the higher K factor - Answer results in a higher degree of scatter and secondary radiation clean-up specialized cells of the retina convert the visual image to - Answer nervous impulses the relationship between mAs and exposure is - Answer directly proportional the cumulative effective dose limit for occupational exposure to ionizing is ___mrem. A.5,000 B.500 C.50 D.none of the above - Answer none of the above