# Radiology Chapter 4

### 22 terms by VaniaNixon

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Exposure Factors

### Caliper

a device used to measure the thickness of anatomic parts

### Contrast

the measurable difference between two adjacent densities

### Density

the degree of blackness on a radiograph

### Exposure Time

the period of time during which x-rays are permitted to leave the x-ray tube

### Inverse Square Law

the intensity of the radiation varies inversely as the square of the distance from the source

### Kilovoltage

related to thousands of volts. Describes the electrical potential (differences) between the cathode and the anode; it is responsible for accelerating the electrons from the cathode to the anode and relates to the penetrating power the x-rays.

### Kinetic energy

the energy related to motion

### Milliamperage-seconds (mAs)

the number of x-rays produced over a given period. Calculated by multiplying the milliamperage by the time

### Milliampere

one thousandth of an ampere. A measure of electron current to the filament, which has a direct relationship to the number of x-rays produced.

### Sante's rule

a method of estimating kilovoltage in relation to area thickness (2x thickness) +40 = kVp

### Source-image distance (SID)

formerly called focal-film distance (FFD) the distance between the source of x-rays and the image receptor or film

### Thermionic emmission

the process of releasing electrons from their anatomic orbits by heat

### ways to decrease the number of personnel in the radiology suite include

sedating patients

increasing kVp

100 mAs

64

### The source-image distance

must be considered each time the control panel is set

x-rays

mA setting

### Which is a characteristic of x-rays

their intensity increases as SID decreases

kilovolts

lower, lower

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