tomography

Question 1

Tomography is also known as

Answer 1

body section radiography

Question 2

A special x-ray technique that blurs out the shadows of superimposed structures to show more clearly the principle structures examined

Answer 2

Tomography

Question 3

The object being examined is not focused in the normal sense, but rather its ________ is enhanced by the blurring of the adjacent structures.

Answer 3

radiographic contrast

Question 4

Other names for Tomography

Answer 4

Planigraphy, stratigraphy, Laminography

Question 5

Simplest type of tomography

Answer 5

Linear tomography

Question 6

Essential ingredients for linear tomography

Answer 6

1. X-ray tube
2. movable bucky
3. rigid connecting rod

Question 7

Rigid connecting rod rotates about a ____

Answer 7

fixed fulcrum

Question 8

Tube and cassette move in ______ directions

Answer 8

opposite

Question 9

_____ is the only point in the system that remains stationary

Answer 9

fulcrum

Question 10

Uses a _________ focal spot for improved recorded detail

Answer 10

small

Question 11

Fulcrum

Answer 11

The imaginary pivot point about which the tube and film move. it lies within the object or focal plane

Question 12

object/focal plane

Answer 12

• The plane of maximum focus.
• All objects outside this plane will be blurred due to motion unsharpness caused by the movement of the tube and the cassette.

Question 13

Grossman principle

Answer 13

• Fulcrum is stationary

- Table is raised or lowered

Question 14

planigraphic principle

Answer 14

• adjustable fulcrum system
• fulcrum is raised or lowered
• Table/patient remain stationary

Question 15

Tomographic angle determines:

Answer 15

thickness of the tomographic cut

Question 16

Tomographic angle

Answer 16

The angle of the tube movement (while the xray tube is energized) measured in degrees.

Question 17

The larger the angle, the ______ the thickness

Answer 17

smaller

Question 18

The smaller the angle, the ______ the thickness

Answer 18

larger

Question 19

Types of tube motion

Answer 19

Linear, circular, elliptical, figure 8, hypocycloidal, spiral, trispiral

Question 20

How do you determine the level of the tomo scout

Answer 20

1. measure the patient
2. divide the measurement by 2
3. subtract 2 cm from that number (because the kidneys are retroperenel)

Question 21

Advantage

Answer 21

increases radiographic contrast

Question 22

disadvantage

Answer 22

increases patient dose due to the tube being energized for the entire length of travel

Question 23

Tomography superceded by

Answer 23

ct and mri