LMRT Review #4 QUESTIONS WITH COMPLETE SOLUTIONS

Which of the following transformers reduces the voltage on the secondary side to provide an appropriate current to heat the filament? correct answer: step-down transformer The process of causing alternating (A-C) current to flow in one direction (D-C) only is called: correct answer: Rectification The maximum heat capacity of the anode of the X-ray tube is rated in terms of correct answer: heat units Nearly all new x-ray machines manufactured today use _________________ generators correct answer: high frequency The primary controlling factor of radiographic receptor exposure is correct answer: mAs When a body part appears on a radiograph as shorter than it actually is, the term used is: correct answer: foreshortening When a body part appears on a radiograph longer than it actually is, the term is used correct answer: Elongation What is the guiding philosophy of radiation protection correct answer: ALARA (as low as reasonably achievable) In general, which radiation affect are we most concerned about? correct answer: Long term The x-ray beam changes as it travels through the patient by a process called correct answer: attenuation The intensity of radiation is inversely, proportional to the square of the distance between the source of radiation and the person receiving it. This describes the. correct answer: inverse square law What device is turned by a rotor? correct answer: anode The process of thermionic emission causes: correct answer: Electrons to boil off the filament Heat is produced in the x-ray tube as correct answer: Electrons interact with the target material The collimator must be accurate to a level of: correct answer: 2% of the SID Which of the following describes the relationship between mAs and receptor exposure correct answer: Receptor exposure is directly propor