Rad 1230 Introduction Pt. 2

Exposure factors

kVp, mA, and exposure time

mAs formula?

mA x seconds = mAs

What is high contrast?

short scale, black and white

Low contrast?

long scale (more shades of grey)

Involuntary motion

movement that the patient cannot control

Voluntary motion

Motion that is under the control of the patient.

Anode Heel Effect?

Beam intensity is greater under cathode; place thicker part under cathode

Distortion

Misinterpretation of object size or shape

Distortion controlled?

SID,OID,object IR alignment, and CR alignment

Open joints

The part should be parallel to IR, and CR should be parallel to joint space

Exposure Index

Numeric indicator of exposure received by IR

Spatial Resolution

Recorded sharpness; affected by acquistuon pixel size and display matrix

What is anatomical position

The body is erect, the feet are slightly apart, the head is held high, and the palms of the hands are facing forward

Patient position

How the patient is placed

Radiographic projection

Path of beam

What is AP projection

Enters anterior and exits posterior

What is a PA projection?

CR enters the posterior surface and exits the anterior

The elbow is _________ to the wrist?

proximal

Flexion

Decrease of angle of two bones

Extension

Increasing the angle between two bones

The 3 cardinal rules

Time, distance, shielding

What is Air Kerma measured?

Rontgen; in air

Gray?

Rad;Patient absorbed

Sivert (Sv)

Rem; dose equivalent

Why must a right or left lead marker be placed on IR before exposure?

Liability; as well as lets the viewer know the correct side the image was taken

If you are running late what should you do?

Call or text

What is the latest time you have to call before it becomes double incident?

15 minutes