RAD 170 Exam 1 Review

Which of these is not one of the four radiographic quality factors?

• Receptor Exposure

• Spatial Resolution

• mAs

• Distortion

Answer explanation

The 4 radiographic qualities are:

Brightness​

Contrast​

Spatial Resolution​

Distortion

Tags

NGSS.HS-PS4-5

NGSS.HS-PS4-3

Which term describes absorption characteristics of the anatomic tissues radiographed?

• Subject contrast

• Image contrast

• Recorded detail

Tags

NGSS.HS-PS4-4

Which of these factors does NOT affect spatial resolution?

• SID

• mAs

• Focal spot size

• Tube angle

Answer explanation

While mAs will affect the amount of exposure (EI #) in our image, it will not affect the resolution.

A smaller actual focal spot will provide _____ detail than a larger actual focal spot

• Better

• Worse

• The same

• Focal spots do not affect detail

What is the ideal relationship between SID and OID to produce the best spatial resolution?

• Decreased OID, Decreased SID

• Decreased OID, Increased SID

• Increased OID, Increased SID

• Increased OID, Decreased SID

Which of the following terms is used to describe unsharp edges of tiny radiographic details?

• Diffusion

• Mottle

• Penumbra (blur)

• Umbra

Changing the size of the actual focal spot will cause a change in (select all that apply):

• Spatial resolution

• effective focal spot size

• Image sharpness

• Image contrast

The visual cues of exposure errors are obvious in digital radiography are immediately displayed to the technologist in the image.

• True

• False

Answer explanation

Technique errors are not displayed visually with digital imaging, you need to evaluate the EI/DI # to determine if your technique set was appropriate

Compared to other anatomic tissues, _________ is considered a low x-ray attenuator and will produce ________ densities on the radiographic image. 

• bone, lighter

• air, darker

• bone, darker

• air, lighter

Answer explanation

Attenuation= reduction of the beam as it passes through tissue. Since air allows the passage of x-rays with little to no loss of energy, it is considered a low attenuator (bone would be a high attenuator)

 Which of the following radiographic exposure techniques would produce the best resolution?

• 2” OID, small focal spot, 72” SID

• 2” OID, large focal spot, 72” SID

• 2” OID, large focal spot, 36” SID

• 4” OID, small focal spot, 72” SID