Question 1

All of the following affect visibility of detail EXCEPT

Accepted Answer

A) 15% rule. 
B) filtration. 
C) radiographic grids. 
D) SID. 
A) 15% rule. 
B) filtration. 
C) radiographic grids. 
D) SID. D

Question 2

The Nyquist frequency is

Accepted Answer

A) important in analog imaging. 
B) sampling a minimum of twice per cycle. 
C) unique to radiography. 
D) related to involuntary motion. 
A) important in analog imaging. 
B) sampling a minimum of twice per cycle. 
C) unique to radiography. 
D) related to involuntary motion. B

Question 3

Resolution is improved when

Accepted Answer

A) OID increases. 
B) OID decreases. 
C) SID decreases. 
D) the x-ray tube is angled 
A) OID increases. 
B) OID decreases. 
C) SID decreases. 
D) the x-ray tube is angled B

Question 4

As focal spot size decreases,

Accepted Answer

A) umbra is improved. 
B) penumbra decreases. 
C) resolution increases. 
D) all of the above 
A) umbra is improved. 
B) penumbra decreases. 
C) resolution increases. 
D) all of the above

Question 5

When the sampling frequency is less than the Nyquist value,

Accepted Answer

A) aliasing is eliminated. 
B) the Moire effect can occur. 
C) patient dose must increase. 
D) the Nyquist value must be altered. 
A) aliasing is eliminated. 
B) the Moire effect can occur. 
C) patient dose must increase. 
D) the Nyquist value must be altered.

Question 6

Match the following choices with respect to recorded detail.
-results from insufficient mAs

Accepted Answer

A) PSF 
B) quantum noise 
C) resolution increase 
D) MTF 
E) MF
F)LSF
G)aliasing
H)loss of visibility of detail 
A) PSF 
B) quantum noise 
C) resolution increase 
D) MTF 
E) MF
F)LSF
G)aliasing
H)loss of visibility of detail

Question 7

Which radiograph exhibits the best detail?

Accepted Answer

A) a PA chest radiograph for evaluation of the heart at 40 in. 
B) a PA chest radiograph for evaluation of the heart at 72 in. 
C) an AP chest radiograph for evaluation of the heart at 40 in. 
D) an AP chest radiograph for evaluation of the heart at 72 in. 
A) a PA chest radiograph for evaluation of the heart at 40 in. 
B) a PA chest radiograph for evaluation of the heart at 72 in. 
C) an AP chest radiograph for evaluation of the heart at 40 in. 
D) an AP chest radiograph for evaluation of the heart at 72 in.

Question 8

A digital detector with a high fill factor

Accepted Answer

A) will produce poor resolution. 
B) will require longer processing time. 
C) will produce high resolution. 
D) is undesirable. 
A) will produce poor resolution. 
B) will require longer processing time. 
C) will produce high resolution. 
D) is undesirable.

Question 9

Factors affecting recorded detail include

Accepted Answer

A) kVp. 
B) radiographic grids. 
C) mAs. 
D) focal spot size. 
A) kVp. 
B) radiographic grids. 
C) mAs. 
D) focal spot size.

Question 10

In general radiography, quantum noise is

Accepted Answer

A) filtered out of images. 
B) a function of mAs and kVp. 
C) designed into the receptor specifications. 
D) a recorded detail parameter. 
A) filtered out of images. 
B) a function of mAs and kVp. 
C) designed into the receptor specifications. 
D) a recorded detail parameter.

Question 11

Calculate the penumbra for an image taken with a 2.0 mm focal spot, at a 40 in.distance, and OID of 2 in.

Accepted Answer

The answer of Calculate the penumbra for an image taken...

Question 12

Spatial resolution in digital imaging is determined by the

Accepted Answer

A) bit depth. 
B) matrix size. 
C) pixel size. 
D) all of the above 
A) bit depth. 
B) matrix size. 
C) pixel size. 
D) all of the above

Question 13

You have completed a chest radiograph on a 2-month-old infant using a restraining device at a 72" SID.Because of the design of the device, your OID is suboptimum.The image reveals good resolution of the bony anatomy but the pulmonary vasculature is blurred.The EI value is 2040.In an effort to improve the quality of the repeat image, the competent radiographer would

Accepted Answer

A) raise the mA and decrease the exposure time. 
B) decrease the SID and maintain the same mAs. 
C) switch to small focal spot. 
D) ask for mild sedation of the infant to decease respiration. 
A) raise the mA and decrease the exposure time. 
B) decrease the SID and maintain the same mAs. 
C) switch to small focal spot. 
D) ask for mild sedation of the infant to decease respiration.

Question 14

Calculate the penumbra for an image taken with a 2.0 mm focal spot, at a 72 in.distance, and OID of 6 in.

Accepted Answer

The answer of Calculate the penumbra for an image taken...

Question 15

For general radiography, an MTF value of 1 is

Accepted Answer

A) average. 
B) suboptimum. 
C) theoretically impossible. 
D) a function of mAs. 
A) average. 
B) suboptimum. 
C) theoretically impossible. 
D) a function of mAs.

Question 16

When evaluating the degree of resolution on an actual radiograhic image, an effective tissue to analyze is

Accepted Answer

A) heart size. 
B) bony trabecular pattern. 
C) kidney. 
D) patient body fat stripes. 
A) heart size. 
B) bony trabecular pattern. 
C) kidney. 
D) patient body fat stripes.

Question 17

Recorded detail is

Accepted Answer

A) the degree of geometric sharpness. 
B) definition. 
C) the accuracy of the structural lines actually recorded in the radiographic image. 
D) all of the above 
A) the degree of geometric sharpness. 
B) definition. 
C) the accuracy of the structural lines actually recorded in the radiographic image. 
D) all of the above

Question 18

Resolution is improved when

Accepted Answer

A) OID increases. 
B) SID increases. 
C) SID decreases. 
D) the receptor is angled. 
A) OID increases. 
B) SID increases. 
C) SID decreases. 
D) the receptor is angled.

Question 19

Calculate the penumbra for an image taken with a 1.0 mm focal spot, at a 40 in.distance, and OID of 2 in.

Accepted Answer

The answer of Calculate the penumbra for an image taken...

Question 20

The ____ represents a depth to the information in the digital image.

Accepted Answer

A) z axis 
B) y-x grid matrix 
C) y axis 
D) x-y grid matrix 
A) z axis 
B) y-x grid matrix 
C) y axis 
D) x-y grid matrix

Exam 28: Recorded Detail

All of the following affect visibility of detail EXCEPT

The Nyquist frequency is

Resolution is improved when

As focal spot size decreases,

When the sampling frequency is less than the Nyquist value,

Match the following choices with respect to recorded detail. -results from insufficient mAs

Which radiograph exhibits the best detail?

A digital detector with a high fill factor

Factors affecting recorded detail include

In general radiography, quantum noise is

Calculate the penumbra for an image taken with a 2.0 mm focal spot, at a 40 in.distance, and OID of 2 in.

Spatial resolution in digital imaging is determined by the

Calculate the penumbra for an image taken with a 2.0 mm focal spot, at a 72 in.distance, and OID of 6 in.

For general radiography, an MTF value of 1 is

When evaluating the degree of resolution on an actual radiograhic image, an effective tissue to analyze is

Recorded detail is

Resolution is improved when

Calculate the penumbra for an image taken with a 1.0 mm focal spot, at a 40 in.distance, and OID of 2 in.

The ____ represents a depth to the information in the digital image.

Basic Mathematics

Radiation Concepts

Electricity

Electromagnetism

X-Ray Equipment

The X-Ray Tube

X-Ray Production

Radiation Protection Concepts and Equipment

Radiation Protection Procedures for Patients and Personnel

Filtration

The Prime Factors

X-Ray Interactions

Minimizing Patient Dose

Vision and Perception

Beam Restriction

The Patient As a Beam Emitter

The Pathology Problem

The Grid

Radiographic Film

Film Processing

Film Sensitometry

Intensifying Screens and Film Screen Combinations

Digital Radiography

Picture Archiving and Communication Systems Pacs

The Imaging Process

Densityir Exposure

Contrast

Distortion

The Art of Image Critique

Quality Management

Exposure Systems and Charts

Automatic Exposure Controls

Exposure Conversion Problems

Mobile Radiography

Fluoroscopy

Tomography and Digital Tomosynthesis

Mammography

Bone Densitometry

Vascular Imaging Equipment

Computed Tomography

Magnetic Resonance Imaging

Nuclear Medicine

Radiation Therapy

Diagnostic Medical Sonography

Filters