Question 1

Which of the following is a popular tilted plane reconstruction?

Accepted Answer

A) advanced single-slice rebinning 
B) helical rebinning 
C) single-slice rebinning 
D) tomography rebinning

Question 2

An algorithm common in multislice computed tomography scanners is the Feldkamp-Davis-Kress algorithm.

Accepted Answer

A) True 
 B)False

Question 3

The overall goal of multislice computed tomography is to:

Accepted Answer

A) improve volume coverage speed performance 
B) decrease patient dose 
C) improve spatial resolution 
D) increase tube memory

Question 4

The radiation sensors convert ___________ to ___________.

Accepted Answer

A) light; x-ray photons 
B) x-ray photons; light 
C) light; electrical signals 
D) electric signals; light

Question 5

All of the following are housed in the multislice computed tomography gantry except:

Accepted Answer

A) detectors 
B) detector electronics 
C) collimation selector 
D) x-ray tube

Question 6

In multislice computed tomography, the slice thickness is determined by the: 
I. beam width in the z-axis
II. pitch
III. shape and width of the reconstruction filter

Accepted Answer

A) I and II 
B) II and III 
C) I and III 
D) I, II, and III

Question 7

Pitch directly relates to: 
I. patient comfort
II. patient dose
III. volume scanned

Accepted Answer

A) I and II 
B) II and III 
C) I and III 
D) I, II, and III

Question 8

When the slice thickness is equal to the pixel size, the data acquired are said to be:

Accepted Answer

A) anisotropic 
B) distropic 
C) isotropic 
D) unitropic

Question 9

The photodiodes convert _________ into ________.

Accepted Answer

A) light; x-ray photons 
B) x-ray photons; light 
C) light; electrical signals 
D) electric signals; light

Question 10

The computer systems of multislice computed tomography scanners have hardware that provides all of the following except:

Accepted Answer

A) high speed processing 
B) image communication 
C) image reconstruction 
D) postprocessing operations

Question 11

To prevent anode movement under the stress of subsecond acceleration, new x-ray tubes have the anode mounted on a shaft that extends along the tube.

Accepted Answer

A) True 
 B)False

Question 12

If the x-ray prepatient collimation width is 24 cm and the scanner has a four-row detector array, what is the detector row collimation?

Accepted Answer

A) 4 mm 
B) 5 mm 
C) 6 mm 
D) 7 mm

Question 13

All of the following are advantages of multislice computed tomography except:

Accepted Answer

A) increased speed and volume coverage 
B) improved spatial resolution 
C) reduction of radiation exposure 
D) decreased contrast resolution

Question 14

The computed tomography detector consists of: 
I. radiation sensors
II. suitable electronics
III. slip rings

Accepted Answer

A) I and II 
B) II and III 
C) I and III 
D) I, II, and III

Question 15

What term is used to describe the separating of the direct and complementary data trails and also results in efficient z-sampling?

Accepted Answer

A) efficient sampling scan 
B) complete sampling scan 
C) optimized sampling scan 
D) total sampling scan

Question 16

Which of the following describes when raw data for image reconstruction can be selected on the basis of the patient's electrocardiogram?

Accepted Answer

A) cardiac reconstruction 
B) gated reconstruction 
C) motion reconstruction 
D) timed reconstruction

Question 17

Which of the following are algorithms that were developed to reconstruct from variable slice thicknesses? 
I. longitudinal interpolation by z-filtering
II. spiral/helical scanning by interlaced scanning
III. spiral/helical scanning by optimized sampling

Accepted Answer

A) I and II 
B) II and III 
C) I and III 
D) I, II, and III

Question 18

A pitch greater than 1 will result in an increased dose.

Accepted Answer

A) True 
 B)False

Question 19

What type of detector is used in multislice computed tomography scanners?

Accepted Answer

A) helium gas detector 
B) solid-state scintillation detector 
C) tungsten detector 
D) xenon gas detector

Question 20

What term is used to describe the number of data collection channels and the effective section thickness determined by the data acquisition system settings?

Accepted Answer

A) detector array 
B) detector configuration 
C) detector geometry 
D) detector set

Exam 12: Multislice Spiralhelical Computed Tomography: Physical Principles and Instrumentation

Which of the following is a popular tilted plane reconstruction?

An algorithm common in multislice computed tomography scanners is the Feldkamp-Davis-Kress algorithm.

The overall goal of multislice computed tomography is to:

The radiation sensors convert _ to _.

All of the following are housed in the multislice computed tomography gantry except:

In multislice computed tomography, the slice thickness is determined by the: I. beam width in the z-axis II. pitch III. shape and width of the reconstruction filter

Pitch directly relates to: I. patient comfort II. patient dose III. volume scanned

When the slice thickness is equal to the pixel size, the data acquired are said to be:

The photodiodes convert _ into .

The computer systems of multislice computed tomography scanners have hardware that provides all of the following except:

To prevent anode movement under the stress of subsecond acceleration, new x-ray tubes have the anode mounted on a shaft that extends along the tube.

If the x-ray prepatient collimation width is 24 cm and the scanner has a four-row detector array, what is the detector row collimation?

All of the following are advantages of multislice computed tomography except:

The computed tomography detector consists of: I. radiation sensors II. suitable electronics III. slip rings

What term is used to describe the separating of the direct and complementary data trails and also results in efficient z-sampling?

Which of the following describes when raw data for image reconstruction can be selected on the basis of the patient's electrocardiogram?

Which of the following are algorithms that were developed to reconstruct from variable slice thicknesses? I. longitudinal interpolation by z-filtering II. spiral/helical scanning by interlaced scanning III. spiral/helical scanning by optimized sampling

A pitch greater than 1 will result in an increased dose.

What type of detector is used in multislice computed tomography scanners?

What term is used to describe the number of data collection channels and the effective section thickness determined by the data acquisition system settings?