Chapter 3 Assignment

Question 1

A high SNR will produce what type of spatial resolution on an image?

a.) high
b.) low

Answer 1

a.) high

Question 2

A large matrix will offer what type of spatial resolution?

a.) greater
b.) less

Answer 2

a.) greater

Question 3

If an imaging system operated with a DQE of 1, patient dose may potentially be:

a.) increased
b.) reduced

Answer 3

b.) reduced

Question 4

If the bit depth of a magnetic resonance imaging scanner is 14 bits, how many gray shades can be present in the image?

a.) 2048
b.) 4096
c.) 8192
d.) 16384

Answer 4

d.) 16384

Question 5

What unit is spatial resolution measured in?

Answer 5

lp/mm

Question 6

Which of the following describes the type of contrast that is caused by variations in the tissue density within the anatomic part to be imaged?

a.) image contrast
b.) inherent contrast
c.) subject contrast
d.) none of the answers are correct

Answer 6

c.) subject contrast

Question 7

The window level setting in a digital imaging system is used to manupulate which of the following values?

a.) temporal resolution
b.) image brightness
c.) image contrast
d.) spatial resolution

Answer 7

b.) image brightness

Question 8

The window width setting in a digital imaging system is used to manipulate which of the following values?

a.) image brightness
b.) temporal resolution
c.) image contrast
d.) spatial resolution

Answer 8

c.) image contrast

Question 9

Which of the following does not affect patient dose during diagnostic radiography?

a.) inherent filtration
b.) added filtration
c.) source to image distance
d.) focal spot size

Answer 9

d.) focal spot size

Question 10

Which of the following is known as low contrast resolution?

a.) contrast resolution
b.) spatial resolution
c.) matrix resolution
d.) none of the above

Answer 10

a.) contrast resolution

Question 11

An artifact thats created by too few xray photons striking the IR is termed:

Answer 11

noise/quantam mottle

Question 12

Which of the following modalities generally displays the greatest spatial resolution?

a.) computed radiography
b.) nuclear medicine
c.) digital radiography
d.) digital mammography

Answer 12

d.) digital mammography

Question 13

Which of the following terms best describes the ability of an imaging system to create seperate images of closely spaced high contrast objects?

a.) spatial resolution
b.) contrast resolution
c.) screen speed
d.) quantam mottle

Answer 13

a.) spatial resolution

Question 14

Which of the following best describes the ability of an imaging system to tell structures with similar thickness or density apart?

a.) spatial resolution
b.) contrast resolution
c.) temporal resolution
d.) inherent resolution

Answer 14

b.) contrast resolution

Question 15

Which of the following is known as high contrast resolution?

a.) spatial resolition
b.) contrast resolution
c.) temporal resolution
d.) inherent resolution

Answer 15

a.) spatial resolution

Question 16

Which of the following is known as low contrast resolution?

a.) contrast resolution
b.) spatial resolution
c.) matrix resolution
d.) none of the above

Answer 16

a.) contrast resolution

Question 17

This type of contrast is dependent on what the system is capable of (film screen, digital, etc…)

a.) contrast resolution
b.) image contrast
c.) inherent contrast
d.) subject contrast

Answer 17

c.) inherent contrast

Question 18

Which term describes the range of exposure over which a detector can acquire data?

a.) LUT
b.) dynamic range
c.) rescaling
d.) DQE

Answer 18

b.) dynamic range

Question 19

Which of the following is part of a systems software that adjust the image to the desired contrast?

a.) LUT
b.) dynamic range
c.) rescaling
d.) DQE

Answer 19

a.) LUT

Question 20

A patient scheduled for a left foot amputation accidentally receives a rhinectomy. This scenario is an example of:

a.) adverse event indicator
b.) sentinel event indicator
c.) risk indicator
d.) an “I found it like that” indicator

Answer 20

b.) sentinel event indicator

Question 21

While performing a routine arthrogram a surgeon accidentally perforates a vessel. This scenario is an example of what:

a.) adverse event indicator
b.) sentinel event indicator
c.) risk indicator
d.) an I found it like that indicator

Answer 21

a.) adverse event indicator

Question 22

A patient recieved injected contrast media and had a severe reaction resulting in death.

a.) adverse event indicator
b.) sentinel event indicator
c.) risk indicator
d.) an i found it like that indicator

Answer 22

b.) sentinel event indicator

Question 23

While performing a routine l spine xray the tech gives the customary request blow all your breath out and hold but the patient mistakenly hears roll all the way on your stomach which results in the patient falling to the floor.

a.) adverse event indicator
b.) senteinel event indicator
c.) risk indicator
d.) an i found it like that indicator

Answer 23

a.) adverse event indicator

Question 24

A generator that produces 100% ripple is most efficent type of generator used in diagnostic imaging.

a.) true
b.) false

Answer 24

b.) false