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LMRT Core Test Review 2024 | Actual Questions And Answers Latest
Updated 2024/2025 (Graded A+)
restrict the XR beam to the clinical area of interest - ✔✔As a professional radiographer, the practice of ALARA requires you to prime - ✔✔The factors that affect XR emission under the direct control of the radiographer are called_ factors beam quality - ✔✔Milliamperage-second (mAs) directly affects all of the following EXCEPT mA & filtration - ✔✔The factors that directly affect XR quantity are kVp & beam filtration - ✔✔The factors that directly affect XR quality are 6.3 x 10(18) - ✔✔If 1 coulomb is equal to 6.3 x 10(18) electron charges, how many electrons flow from cathode to anode 1 second 6.3 x 10(15) - ✔✔If 1 ampere equals a flow of 6.3 x 10(18) electrons per second, how many electrons flow from cathode to anode in 1 milliampere? increase 2-fold - ✔✔As the mA doubles, the number of electrons flowing from cathode to anode XR beam quantity - ✔✔The product of tube current 7 exposure time is equal to change the mAs from 15-21 mAs - ✔✔In order to increase radiographic film density by 40% the radiographer would directly proportional - ✔✔The relationship between mAs & exposure is
the reciprocity law - ✔✔The reaction of a photographic film to light is equal to the product of the intensity of the light and the duration of the light exposure. cause the electrons to travel faster from cathode to anode - ✔✔Increasing the kVp for an exposure will greater energy - ✔✔Increasing the energy of an incident electron will result in the production of an XR photon with radiographic film density - ✔✔Kilovoltage is the primary controlling factor of contrast - ✔✔Adjustments in kVp should be used to control radiographic kVp - ✔✔XR beam penetrability is primarily controlled by 400 mA, 200 ms, 40" SID - ✔✔All factor remaining constant, which of the following set of exposure conditions would yield an image with GREATEST radiographic film density motion - ✔✔The length of the exposure time (S) for a radiograph, is used to primarily control 400 mA,0.110 sec, 80 kVp - ✔✔A radiograph is taken 400 mA, 55 ms, 95 kVp. A second image could be taken to improve contrast at attenuation - ✔✔When an XR photon passes through matter, it undergoes a process called reduce in number - ✔✔During the process of attenuation, XR photons in the beam lead (Z=82) - ✔✔In which element are the inner-shell electrons more tightly bound to the nucleus?
radiation fog - ✔✔Unwanted radiographic image densities caused predominantly by scattered photons is called annihilation reaction - ✔✔In which process is matter converted back to energy? photoelectric absorption - ✔✔Which of the following interactions has a significant impact on the XR image? Compton Scattering - ✔✔In the human body,_ is the predominant interaction through most of the diagnostic XR range greater Compton scatter interactions - ✔✔In effort to decrease the mAs of an exposure, the15% rule of kVp change may be considered. Changing the original kVp of 84 using 15% rule will have what impact increasing atomic # of the absorber - ✔✔The incidence of the photoelectric effect increase with radiographic contrast - ✔✔Photons that pass though the body unaffected produce Compton - ✔✔The atomic interaction that produces scatter radiation is patient - ✔✔The greatest source during a radiographic examination is the for part thickness above 10 cm - ✔✔As a general rule, a radiographic grid is employed a grid is a series of lead strips that alternate w/radiopaque interspace strips - ✔✔Which statement about radiographic grids is incorrect? blur out the radiopaque strips - ✔✔the purpose of moving the grid during the radiographic exposure is to
ratio - ✔✔The ratio of the height of the lead strips to the distance between the lead strips is the grid 6:1 - ✔✔Which grid would have the greatest distance between lead strips? 15:1 - ✔✔Which grids would most effectively reduce scatter? frequency - ✔✔The # of grids lines per inch is the grid the ability of the grid to remove scatter increases - ✔✔As the lead content of a grid increases grid cut-off - ✔✔Angulation across the long axis of a linear grid causes Potter-Bucky diaphragm - ✔✔A device that moves the grid during a radiographic exposure is called a perpendicular - ✔✔A potter-bucky diaphragm must move the grid in a direction that is_ to the direction of the grid lines the use of reusable receptors - ✔✔Digital radiography (DR) is characterized by binary machine - ✔✔Computers operate using a_ language bit - ✔✔Each binary # is called a byte - ✔✔An eight-bit word is called a RAM - ✔✔When the main power to the computer is turned off,_ is erased
3 mm renal calculi (stone) - ✔✔Which of the choices below would produce the highest spatial frequency & contrast? manual processing - ✔✔All of the following are related except one? exposure index & values of interest (VOI) - ✔✔In digital imaging processing, the digital data set is arranged into a histo-graph distribution in order to determine the Apply a predetermined scale of contrast to the digital data set - ✔✔The purpose of a LUT is to Is direct w/matrix size & indirect w/pixel size - ✔✔The relationship b/w digital image resolution MRI - ✔✔Of the many types if digital image procedures performed in a contemporary medical imaging dept, the largest file sizes are typically generated by Compares entrance dose to the detector to a reference industry-standard target dose - ✔✔The deviation index (DI) Exposure to the IP of 1 mR - ✔✔An S value of 200 represents a/an An EI # increase from 1500- 1800 - ✔✔When changing exposure technique from 9 mAs to 18 mAs using computed radiography, the radiographer A loss of contrast - ✔✔Grossly overexposed digital images will demonstrate Repeating an image w/an S # of 210 b/c of exposure technique - ✔✔Of the choices below, the greatest ALARA violation would be 35 keV - ✔✔An XR exposure taken at 80 kVp has an average energy of
Electrons "holes" in Europium - ✔✔In the technology of CR, the latent image is actually Bits/pixel - ✔✔All of the following impact digital image spatial resolution EXCEPT The system will not correct for exposure inadequacies by the computer to adjust density & contrast, ypur exposure techniques must be accurate, similar to film/screen texhnology - ✔✔When using a Fuji CR system in the fixed-mode of operation It is most likely to occur w/DR technology , particularly amorphous selenium - ✔✔All of the following are true of the Moire effect EXCEPT
