Question 1

Dedicated hardware components of computed tomography fluoroscopy include: I. back-projection gate array
II. fast arithmetic unit
III. high-speed memory

Accepted Answer

The dedicated hardware components include a fast arithmetic unit, high-speed memory, and a back-projection gate array.

Question 2

Which step in the computed tomography simulation process includes the beam placement and the treatment design that are executed with virtual simulation software?

Accepted Answer

Planning of the treatment is the step where beam placement and treatment design are executed.

Question 3

Which volume-rendering parameter refers to the degree that structures close to the user obscure structures that are farther away?

Accepted Answer

Opacity refers to the degree that structures close to the user obscure structures that are farther away.

Question 4

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

Accepted Answer

The advantages offered by flat-detector technology such as wide dynamic range, high spatial resolution, excellent linearity, high detective quantum efficiency, and no geometrical distortion provide a good rationale for using them in the design of computed tomography scanners for breast imaging.

Question 5

The basis for continuous computed tomography imaging depends on: I. fast processing algorithm
II. high-speed processing of data
III. slip-ring technology

Accepted Answer

The basis for continuous computed tomography imaging or real-time computed tomography fluoroscopy depends on slip-ring technology, high-speed processing of the data collected from the patient, and a fast processing algorithm for image reconstruction.

Question 6

Which visualization tool refers to the viewing and evaluation of the images in the axial data set by panning through the set of images?

Accepted Answer

Interactive cine refers to the viewing and evaluation of the images in the axial data set by panning through the set of images.

Question 7

Flat-detector computed tomography systems are being used in all of the following except:

Accepted Answer

Flat-detector systems are now being used interventional and intraoperative imaging, radiation therapy, maxillofacial scanning, micro imaging, breast imaging, and in a physical setup where they are incorporated in a standard computed tomography gantry.

Question 8

Technical developments in radiation therapy intended to improve the clinical performance of radiation treatment schemes include all of the following except:

Accepted Answer

Through the years, radiation therapy has experienced significant technical developments intended to improve the clinical performance of radiation treatment schemes, including the use of imaging techniques to provide more accurate localization of tumor volumes, image guidance, and target delineation.

Question 9

The computed tomography simulation process includes: I. scan the patient in the computed tomography scanner
II. plan the treatment and computed tomography simulation
III. treatment setup

Accepted Answer

The computed tomography simulation process includes scanning the patient, planning the treatment, and treatment setup.

Question 10

All of the following are fundamental imaging principles involved in real-time computed tomography except:

Accepted Answer

The fundamental imaging principles involved in real-time computed tomography fluoroscopy are fast continuous scanning, fast image reconstruction, and continuous image display.

Question 11

The computed tomography simulator features all of the following notable components except:

Accepted Answer

There are several notable features that are different from a computed tomography scanner used in diagnostic examinations. For example, this scanner has a flat table top with immobilization devices, a large bore (gantry aperture), a registration device, and a laser system.

Question 12

Which of the following can reduce the dose to the patient during computed tomography fluoroscopy? I. lower tube currents
II. shorter examination times
III. special x-ray filters

Accepted Answer

In computed tomography fluoroscopy, one technique that is incorporated in the design of the equipment to reduce the dose to the patient is the use of a special x-ray filter. In addition, lower tube currents and shorter examination times also play a significant role in reducing patient exposure.

Question 13

During the development of computed tomography fluoroscopy, the dose to the ________ of the operator was a concern.

Accepted Answer

During the development and early implementation of computed tomography fluoroscopy, the dose to the hands of the operator was of particular concern because they were directly in the x-ray beam during the procedure.

Question 14

Which visualization technique uses all of the information in the axial data set to display internal structures?

Accepted Answer

Volume rendering uses all of the information in the axial data set to display internal structures (soft tissues, vascular and bony anatomy) and to provide accurate vessel diameters and three-dimensional vascular relationships.

Question 15

The procedure that describes a geometric simulation process that provides beam arrangements and treatment fields without any dosimetric information is:

Accepted Answer

Computed tomography simulation is a geometric simulation process that provides beam arrangements and treatment fields without any dosimetric information.

Question 16

Protective apparel must be __________ lead equivalent.

Accepted Answer

Protective apparel must be at least 0.5 mm lead equivalent.

Question 17

Image quality parameters in computed tomography fluoroscopy include all of the following except:

Accepted Answer

Image quality parameters in computed tomography fluoroscopy include spatial resolution, density resolution, image noise, and artifacts.

Question 18

The control console for computed tomography fluoroscopy allows the operator to have control of: I. table height
II. table movement
III. detector selection

Accepted Answer

The control console for computed tomography fluoroscopy allows the operator to have full control of the table movement through the gantry, to vary the height of the tabletop, and to tilt the gantry during the interventional procedure.

Question 19

Operators standing in the computed tomography room during the procedure must wear all of the following except:

Accepted Answer

Operators standing in the computed tomography room during the procedure must wear protective lead aprons, thyroid shields, and lead glasses or goggles.

Question 20

The maximum fluoroscopy time for continuous imaging is:

Accepted Answer

The maximum fluoroscopy time for continuous imaging is 100 seconds.

Quiz 13: Other Technical Applications of Computed Tomography Imaging: Basic Principles

Dedicated hardware components of computed tomography fluoroscopy include: I. back-projection gate array II. fast arithmetic unit III. high-speed memory