Quiz for CT Midterm Exam Part 2

Question 1

What dose descriptor is used to describe a measurement of the total amount of exposure for a series of scans?

Accepted Answer

DLP

Question 2

Quantitative CT (QCT) phantoms are used to assess the CT dose output.

Accepted Answer

True

Question 3

Water phantoms are used for QC tests.

Accepted Answer

True

Question 4

Deterministic effects follow a:

Accepted Answer

threshold dose.

Question 5

The slice thickness in CT is determined by the collimator width.

Accepted Answer

True

Question 6

Maximum intensity projection can be used to separate all of the following except:

Accepted Answer

cerebral vascular accidents.

Question 7

The CTDI was developed by the U.S. Food and Drug Administration.

Accepted Answer

True

Question 8

Photodiodes are not used in CT scintillation detectors.

Accepted Answer

False

Question 9

What is the easiest and probably the most accurate method used to report dose?

Accepted Answer

Ionization chamber

Question 10

The old unit of effective dose was the

Accepted Answer

rem

Question 11

What provides the most comprehensive approach to CT dose reduction?

Accepted Answer

Angular-longitudinal tube current module

Question 12

Clinical applications of 3D imaging in CT include all of the following except:

Accepted Answer

endocrine system.

Question 13

Which registry collects CT exam doses and transmits them to the ACR to provide feedback and compare institutions?

Accepted Answer

Dose Index Registry (DIR)

Question 14

Developments in radiation therapy to improve the clinical performance of radiation treatment include all except for:

Accepted Answer

dose fractionation values.

Question 15

The mathematical techniques used by the computer to reconstruct the CT image areknown as image reconstruction algorithms

Accepted Answer

True

Question 16

What term refers to automatic control of mA in two directions during data acquisition by specific technical procedures

Accepted Answer

Automatic tube current modulation (TCM)

Question 17

Each of the following are types of dosimeters that have previously been used to measure dose in CT except:

Accepted Answer

electrometer.

Question 18

A smoothing filter is applied to scans that display very:

Accepted Answer

high brightness.

Question 19

Which is an example of a 3D rendering algorithm?

Accepted Answer

Surface rendering

Question 20

All of the following are shading algorithms except:

Accepted Answer

polygonal shading.

Question 21

Gas-ionization detectors (xenon gas) are used in the majority of commercial CT scanners today.

Accepted Answer

False

Question 22

Which of the following is not a step in the processing of an object-based model into a simulated 3D image?

Accepted Answer

Preprocessing

Question 23

What is the first step in virtual endoscopy imaging?

Accepted Answer

Careful selection of scan parameters

Question 24

Which algorithm is intended to create a thick MPR by using the average ofthe attenuation through the tissues of interest

Accepted Answer

Average intensity projection (AIP)

Question 25

Examples of stochastic effects include each of the following except:

Accepted Answer

cataracts.

Question 26

Volume rendering requires 100% of the data set for postprocessing.

Accepted Answer

True

Question 27

3D algorithms, or rendering techniques, transform the transaxial CT data into simulated 3D images.

Accepted Answer

True

Question 28

The next step after data acquisition that optimizes the images before they are further processed and analyzed is:

Accepted Answer

image preprocessing.

Question 29

Typical 3D processing techniques include software to perform all of the following except:

Accepted Answer

computer-aided diagnosis.

Question 30

What are used for the process of CT dose measurement?

Accepted Answer

Phantoms

Question 31

All the following are advantages offered by flat-detector technology in breast CT scanning except:

Accepted Answer

decreased dose.

Question 32

This algorithm provides aperspective in defining lesions for surgical planning or detecting subtle small airway diseases

Accepted Answer

Minimum intensity projection

Question 33

Stochastic effects are not those effects for which the probability of the effect occurring depends on the dose.

Accepted Answer

False

Question 34

What technique is used to virtually unroll, slice open, and display a 3D model of the colon?

Accepted Answer

Virtual dissection

Question 35

In the semiautomatic mode of __________, the user selects objects to include the data set through the use of windowing.

Accepted Answer

image segmentation

Question 36

CT fluoroscopy is a clinical tool allowing reconstruction and display of images in real time with variable frame rates.

Accepted Answer

True

Question 37

CT fluoroscopy is especially useful for:

Accepted Answer

biopsies., vessel tracking.

Question 38

Which type of 3D imaging approach generates multiplanar reconstruction (MPR) (coronal and sagittal) images?

Accepted Answer

Slice imaging

Question 39

Each of the following are dedicated cardiac CT scanners except:

Accepted Answer

dual-slice.

Question 40

What consideration does effective dose account and weigh?

Accepted Answer

Tissue radiosensitivities

Quiz for CT Midterm Exam Part 2

Questions 40

Quiz for CT Midterm Exam Part 2

Questions 40