Chapter 07: Basic Instrumentation

All of the following are major systems in the basic equipment configuration for computed tomography (CT) except:

a. imaging system.

b. computer system.

c. image display, recording, storage, and communication system.

d. dictation system.

d. dictation system.

The purpose of the imaging system is to perform all of the following except:

a. detect and measure the radiation passing through the cross-section.

b. produce X-rays.

c. store images for retrieval.

d. shape and filter the X-ray.

c. store images for retrieval.

Which of the following does the computer system perform?

a. Detects radiation

b. Image manipulation

c. Display the output image

d. Provides a hard copy

b. Image manipulation

The computer system receives _________ data from the data acquisition system.

a. analog

b. digital

c. manipulated

d. hard copy

b. digital

Which of the following is part of the imaging system?

a. The CT control console

b. The X-ray tube and detectors

c. The cathode ray tube display device

d. The central processing unit (CPU)

b. The X-ray tube and detectors

The imaging system components are located in the:

a. scanner room.

b. radiologist viewing area.

c. operator room.

d. computer room.

a. scanner room.

The computer system for CT includes all of the following except:

a. detector electronics.

b. input-output devices.

c. the CPU.

d. array processors and back-projector.

a. detector electronics

All of the following are purposes of the image display, recording, storage, and communication system except:

a. displays the output digital image.

b. provides a hard copy.

c. facilitates storage.

d. enables scanning procedures.

d. enables scanning procedures

Which of the following is where images are stored in a filmless imaging department?

a. Hospital information system

b. Radiology information system

c. Picture archiving and communications system (PACS)

d. Data acquisition system

Picture archiving and communications system (PACS)

The X-ray generator for CT scanners is usually a:

a. single-phase, half-wave rectified unit.

b. high-frequency unit.

c. three-phase, six-pulse generator.

d. three-phase, 12-pulse generator.

b. high-frequency unit.

The design that incorporates the high-voltage generator on the rotating frame of the CT gantry eliminates:

a. the need for long high-tension cables.

b. the need for short high-tension cables.

c. the detectors from within the gantry.

d. the need for any cables.

a. the need for long high-tension cables.

The opening in the gantry in which the patient is positioned during scanning is called the:

a. rotating frame.

b. isocenter.

c. gantry aperture.

d. positioning hole.

c. gantry aperture.

Most scanners have a gantry aperture of about:

a. 70 mm.

b. 70 inches.

c. 100 cm.

d. 70 cm.

d. 70 cm

In general, the tilting range of a CT gantry is about:

a. ±12 degrees to ±30 degrees.

b. ±2 degrees to ±5 degrees.

c. ±5 degrees to ±5 degrees.

d. no tilting of the gantry is possible.

a. ±12 degrees to ±30 degrees

The ideal couch top (table top) of a CT scanner table has all of the following features except:

a. low radiation absorption characteristics.

b. excellent vibration-damping features.

c. carbon fiber design.

d. limited horizontal and vertical movements.

d. limited horizontal and vertical movements

What classification of CT software builds the CT image from the raw data collected from the detectors?

a. Reconstruction software

b. Reformation software

c. Preprocessing software

d. Image postprocessing software

a. Reconstruction software

The typical matrix size of a typical CT image is:

a. 32 ´ 32 ´ 8 bytes deep.

b. 128 ´ 128 ´ 8 bytes deep.

c. 56 ´ 256 ´ 10 bytes deep.

d. 512 ´ 512 ´ 8 bytes deep.

d. 512 ´ 512 ´ 8 bytes deep.

All of the following media forms can be used to store CT images except:

a. VHS tapes.

b. magnetic disks.

c. laser optical disks.

d. digital videotape.

a. VHS tapes

What method of image compression results in the loss of no information during the compression process?

a. Irreversible compression

b. Lossy compression

c. Permanent compression

d. Lossless compression

d. Lossless compression

Which of the following allows the technologist to alter picture contrast?

a. Touch panel

b. Floating keyboard alphanumerical keys

c. Floppy disk drive

d. Window controls

d. Window controls

Which room generally houses the gantry and patient couch and should be large enough to accommodate gurneys and emergency equipment?

a. Scanning room

b. Computer room

c. Control room

d. Digital room

a. Scanning room

Which of the following allows the technologist to devote more time to the scanning procedure and the needs of the patient?

a. The television monitor

b. Control functions

c. Floppy disks

d. The line printer

b. Control functions

The CT gantry houses all of the following except:

a. the X-ray tube and generator.

b. the CPU.

c. the detector electronics.

d. collimators.

b. the CPU.

Which of the following supports the patient during a CT examination?

a. Life-support equipment

b. The technologist and radiologist

c. The gantry aperture

d. The CT table or patient couch

d. The CT table or patient couch

The following are accessories for a CT scanner except:

a. axial head holder.

b. knee support pad.

c. array processor.

d. pediatric cradle.

c. array processor

The concept of modular design in CT scanner development is intended to:

a. simplify technologist operation.

b. simplify upgrading of scanners.

c. simplify radiologist interpretation of images.

d. make the patient more comfortable.

b. simplify upgrading of scanners.

Hardware modules include all of the following except:

a. back-projectors.

b. array processors.

c. analog to digital conversion cards.

d. application systems packages.

d. application systems packages

Software modules for CT scanners allow each of the following except:

a. facilitate modification of existing packages.

b. revise existing software.

c. alternate analog signals into digital.

d. update existing software.

c. alternate analog signals into digital.

Which of the following houses the host computer and other peripheral computing equipment?

a. The computer room

b. The control room

c. The operator and observer room

d. The scanning room

a. The computer room

Which information system is responsible for patient registration, exam scheduling, and patient tracking?

a. HIS

b. RIS

c. PACS

d. Voice-recognition direction system

b. RIS