Ch. 16 The patient as a Beam Emitter (Exp II) Flashcards
X-rays are attenuated:
Exponentially
The ____ the body part, the ____ the attenuation.
Thicker; greater
Which of the following elements would attenuate a greater percentage of the x-ray beam?
a. Hydrogen
b. Calcium
c. Oxygen
d. Carbon
b. Calcium
Which of the following elements would attenuate a lesser percentage of the x-ray beam?
a. Hydrogen
b. Barium
c. Oxygen
d. Carbon
Hydrogen
Attenuation is greater for elements with more ____ with which the photons may interact.
Electrons
Bone produces less image receptor ____ because it attenuates the x-ray beam more than soft tissue does.
Exposure
For the same exposure intensity, air produces:
Greater exposure intensity to the receptor than other materials
Which of the following is the greatest attenuator of the x-ray beam?
a. Pneumonic lung
b. Pericardial fat
c. Psoas muscle
d. Perirenal fat
c. Psoas muscle
Which of the following is the least attenuator of the x-ray beam?
a. Pneumonated lung
b. Pericardial fat
c. Psoas muscle
d. Perirenal fat
a. Pneumonated lung
As subject density ____, image receptor exposure _____.
Increases; decreases
The degree of differential absorption is referred to as:
Subject contrast
The recorded detail of a structure is dependent on:
- Its position within the body
- The placement of the body in relationship to the film
- The size of the part
Distortion is the misrepresentation of the ____ of an object.
- Length
- Width
- Shape
The primary source of radiation exposure for occupational personnel is due to:
Compton scatter
Because of its tissue composition, the human breast:
Is a low subject contrast structure
With the patient in the posterior-anterior (PA) projection of the abdomen (prone),
The anterior ribs would have high resolution
All of the following refer to patient factors contributing to image quality EXCEPT:
a. Receptor contrast
b. Subject detail
c. Subject contrast
d. Tissue density
a. Receptor contrast
With the perfusion of iodinated contrast material into the kidneys,
A greater degree of photoelectric interactions will occur in the kidneys.
All of the following are related EXCEPT:
a. Air
b. Barium
c. Fat
d. Bone
b. Barium
All of the following are true of Compton scatter EXCEPT:
a. It contributes no meaningful information to the final image
b. Its production increases as tissue density increases
c. It is a significant contributor to occupational radiation exposure
d. Most of the final image is the result of Compton scatter
b. Its production increases as tissue density increases
Clinically speaking from a diagnostic viewpoint, the only useful radiation exposure is that radiation:
Detected by the receptor
With a patient in the supine position, the anatomical structure that would demonstrate the greatest subject detail would be the:
a. Nasal bones
b. Sternum
c. Vertebral pedicles
d. Spinous processes
d. Spinous processes
