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Ch. 15 Study Guide

Terms in this set (33)

An MR image would be identified as:
A. abstract
B. imaginary
C. visual
D. negative
C. visual
Which of the following influence the character of an MRI pixel?
A. electron density
B. spin density
C. optical density
D. motion
E. a, b, & c
F. a, & c
G. b, & d
H. all of the above
G. b, & d
The visual receptors of human eye include the:
A. cornea
B. rods
C. pupil
D. cones
E. a, b & c
F. a, & c
G. b, & d
H. all of the above
G. b, & d
Human visual reception portrays light as:
A. pixel location and character
B. character and gray scale resolution
C. gray scale resolution and intensity
D. intensity and color
A. pixel location and character
An MR image represents what tissue characteristic?
A. optical density
B. electron density
C. gyromagnetic ratio
D. hydrogen concentration
D. hydrogen concentration
The ability to detect differences in brightness level is termed:
A. contrast perception
B. visual acuity
C. color perception
D. conspicuity
A. contrast perception
Color is best visualized with
A. rods
B. cones
C. fovea centralis
D. cornea
B. cones
An MR image has two principle characteristics:
A. spatial resolution and location
B. location and character
C. character and contrast resolution
D. contrast resolution and spatial resolution
D. contrast resolution and spatial resolution
When evaluation the gross anatomy visible in an MR image, the basic geometric factors are:
A. size
B. shape
C. position
D. character
E. a, b, & c
F. a, & c
G. b, & d
h. all of the above
E. a, b, & c
When evaluating the position of an anatomical structure in an MR image, the possibilities include:
A. normal
B. intrinsically malpositioned
C. extrinsically displaced
D. distorted
E. a, b, & c
F. a, & c
G. b, & d
H. all of the above
E. a, b, & c
Pixel location is determined by:
A. intrinsic modification
B. extrinsic pressure
C. magnetic field gradients
D. RF pulse sequence
C. magnetic field gradients
The number of principal MR imaging parameters matches the number of primary colors. That number is:
A. one
B. three
C. five
D. seven
B. three
Abnormal tissue characteristic is best exhibited by:
A. intrinsic deformity
B. extrinsic compression
C. extrinsic displacement
D. unexpected pixel brightness
D. unexpected pixel brightness
Which of the following seem to be easiest to detect on an MR image?
A. diffuse abnormality
B. diffuse pixel brightness
C. focal lesion
D. airway abnormality
C. focal lesion
Pixel character is determined by:
A. intrinsic modification
B. extrinsic pressure
C. magnetic field gradient
D. RF pulse sequence
D. RF pulse sequence
An MR image would be identified as:
A. abstract
B. imaginary
C. visual
D. negative
C. visual
An MR image sometimes called a ______ image.
A. static
B. dynamic
C. representational
D. characteristic
C. representational
The ability to perceive fine details is called:
A. contrast reception
B. visual acuity
C. color perception
D. conspicuity
B. visual acuity
The human eye can detect approximately_____ shades of color
A. two
B. twenty
C. two hundred
D. two thousands
E. two millions
D. two thousands
Pixel in MR image has two characteristics:
A. spatial resolution and contrast resolution
B. contrast resolution and location
C. location and character
D. character and color
C. location and character
Sharpest vision is made when the light is focused on:
A. rods
B. cones
C. fovea centralis
D. cornea
C. fovea centralis
When evaluating the size of an anatomical part in an MR image the specific descriptive are:
NOTE: Answer may include more than one response. check as many apply.
A. normal
B. intrinsically deformed
C. extrinsically compressed
D. distorted
E. all of the above
F. none of the above
A. normal,
B. intrinsically deformed,
& C. extrinsically compressed
When post-processing an MR image, ROI stands for:
NOTE: Answer may include more than one response, check all that apply.
A. region of interest
B. relaxation on inversion
C. a method of obtaining quantitative data
D. a method of observing qualitative change
A. region of interest,
& C. a method of obtaining quantitative data
The principle parameters influencing the character is an MRI pixel are:
NOTE: Answer may include more than one response, check all that apply.
A. spin density
B. T1 relaxation
C. T2 relaxation
D. electromagnetic induction
A. spin density,
B. T1 relaxation,
& C. T2 relaxation
When evaluating the size of an anatomical structure in an MR image, the appropriate classifications are:
NOTE: Answer may include more than one response, check all that apply.
A. small
B. normal
C. large
D. distorted
A. small,
B. normal,
& C. large
Cones of the human retina:Note: Select as many apply.
A. are less sensitive to light than rods
B. are used primarily for photopic vision
C. can respond to intense light levels
D. are primarily used for daytime vision
A. are less sensitive to light than rods,
B. are used primarily for photopic vision,
C. can respond to intense light levels,
& D. are primarily used for daytime vision
The character of pixel is represented by its:
Note: Select as many apply.
A. size
B. brightness
C. location
D. color
B. brightness,
& D. color
Which of the following influence the character of an MRI pixel?Note: Select as many apply.
A. electron density
B. spin density
C. optical density
D. motion
B. spin density,
& D. motion
The visual receptors of the human eye include the:
Note: Select as many apply.
A. cornea
B. rods
C. pupil
D. cones
B. rods,
& cones
Rods of the human retina are:
Note: Select as many apply.
A. more sensitive than cones
B. respond to intense light levels
C. used principally for scotopic vision
D. used primarily for daytime vision
A. more sensitive than cones,
& C. used principally for scotopic vision
Match the following:
Terms:
A. intensity
B. night vision
C. color
D. day vision

Definitions:
1. brightness
2. photopic vision
3. hue
4. scotopic vision
A. intensity - 1. brightness
B. night vision - 4. scotopic vision
C. color - 3. hue
D. day vision - 2. photopic vision
Match the following types of images with their representational media

Terms:
A. electron density
B. reflectivity
C. radioactive decay
D. hydrogen concentration

Definitions:
1. MR image
2. ultrasonograph
3. radiograph
4. radionuclide scan
A. electron density - 3. radiograph
B. reflectivity - 2. ultrasonograph
C. radioactive decay - 4. radionuclide scan
D. hydrogen concentration - 1. MR image
Match the following type of images with appropriate image receptors:
Terms:
A. film
B. piezoelectric crystal
C. scintillation detector
D. antenna

Definitions:
1. MR image
2. ultrasonograph
3. radiograph
4. radionuclide scan
A. film - 3. radiograph
B. piezoelectric crystal - 2. ultrasonograph
C. scintillation detector - 4. radionuclide scan
D. antenna - 1. MR image
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