Introduction to Radiology

mAs will determine what when taking a radiograph?

Number of electrons generated

kVp will determine what when taking a radiograph?

Penetrating power (energy) of beams

The more rays absorbed by a tissue mean the image will be?

Lighter - less exposure makes it appear lighter

Scattered rays in the patient will contribute to what on the radiograph?

Grayness

Rays that do not interact/ are not absorbed will appear how on a radiograph?

Darker/ black - no absorption

What is the purpose of an intensifying screen in a radiograph?

Increases the amount of absorption and decrease the amount of exposure

In order of L to R what are the 5 radiographic opacities?

Air

Fat

Water

Bone

Metal

What is Mach phenomenon?

The more differences in opacity will make the brain see lines that aren't truly there

What is radiopacity?

White areas on a radiograph/ lighter

What is radiolucency?

Looks more black (less bone density)

What four things make for a quality radiographic study?

Good positioning

Appropriate technique

Appropriate labeling

At least 2 views

What is overexposure?

Making the image darker and unable to see soft tissue - lose important info

What is underexposure?

Making an image too light - can cause artifactual lesions

In a lateral radiograph the cranial/ rostral side will always point ____?

Left

In a lateral radiograph the caudal side will always point ___?

Right

In a lateral radiograph the dorsal side will be ___ and the ventral side will point __?

Uppermost

Lowest

In a V/D or D/V cranial will be ___ and caudal will be __?

Uppermost

Bottom

In a V/D or D/V left will point __ and right will point ___?

Right

Left

Identify the type of radiograph taken?

Abdominal VD

Identify the type of radiograph taken?

R lat thorax

This image is?

overexposed

This image is?

underexposed

What are the possible paths of an x-ray through the body?

no interaction

absorbed

scattered

What is vision?

what the eye sees

What is perception?

what the brain sees