# Shared Flashcard Set

## Details

Quiz
Chapter 8
19
Health Care
05/05/2015

Term
 x-ray quantity is the. . .
Definition
 intensity of the x-ray beam (number of x-rays in useful beam)
Term
 what is x-ray quantity (intesity) measured in
Definition
 roentgens or milligrays or milliroentgens
Term
 what does the roentgen measure
Definition
 number of ion pairs produced in air by a quantity of x-rays
Term
 how are mAs and x-ray quantity related
Definition
 directly proportional
Term
 how is kVp and x-ray quantity related
Definition
 x-ray quantity is proportional to the square of the ratio of the kVp;
Term
 how is distance and x-ray quantity related
Definition
 x-ray quantity(intesity) is inversely proportional to the square of the distance from the source
Term
 inverse square law
Definition
 I1/I2= (D2/D1)2
Term
 square law
Definition
 mAs1/mAs2=SID1(2)/SID2(2)
Term
 how much filtration does an x-ray imaging system have
Definition
 1-3 mm of aluminum
Term
 what is the purpose of filters
Definition
 reduce the number of low-energy x-rays that reach the patient, and patient dose is reduced
Term
 what is x-ray penetrability called
Definition
 x-ray quality
Term
 how is x-ray beam energy and penetrability related
Definition
 directly proportional
Term
 how is x-ray quality identified numerically
Definition
 half value layer
Term
 what is the half value layer of an x-ray beam
Definition
 the thickness of absorbing material (aluminum) necessary to reduce the x-ray intesity to half of its original value
Term
 what are the 2 factors that affect HVL
Definition
 kVp and filtration
Term
 what are the 2 factors that affect x-ray quality
Definition
 kVp and filtration
Term
 how does kVp affect x-ray quality
Definition
 as it increases, it also increases the effective energy and penetrability of the beam
Term
 how does filtration affect x-ray quality
Definition
 as it increases, it increases the quality of the beam
Term
 what are the three types of filters
Definition