Deck 7: Radiographic Imaging

Question 1

All of the following are related except

A) source of electrons.
B) means for setting electrons in high-speed motion.
C) a target to stop or suddenly decelerate the electron travel.
D) aluminum filtration material.

Answer 1

D

Question 2

Bowel gas in the abdomen is an example of a _____ material,with regard to the X-ray beam.

A) radiopaque
B) radiolucent
C) radiofrequent
D) radioresistant

Answer 2

B

Question 3

As you position patients for various radiographic procedures,you will occasionally angle the X-ray tube assembly.This intentional use of tube angles is referred to as

A) size distortion.
B) size minification.
C) shape distortion.
D) magnification.

Answer 3

C

Question 4

The invisible,unprocessed data on an image detector immediately after X-ray exposure forms the _____ image.

A) remnant
B) manifest
C) primary
D) latent

Question 5

A direct capture digital radiography detector uses _____ as the receptor material.

A) silver bromide
B) amorphous silicon
C) amorphous selenium
D) barium fluorohalide

Question 6

The x-radiation that is "left over" and exits the patient to strike the image receptor and create the image is known as _____ radiation.

A) remnant
B) primary
C) scatter and secondary
D) nuclear

Question 7

When radiographic images of patients are created,many exposure variables come into play to produce optimum image quality.Any change in the radiographic image appearance should be the result of

A) the experience and competency of the technologist.
B) the radiation output of the X-ray machine.
C) the patient's medical condition as reflected in the image characteristics.
D) computer processing to enhance image contrast.

Question 8

The component that intercepts the remnant radiation from a patient and creates the radiographic image is the

A) radiographic grid.
B) collimator.
C) image receptor.
D) table top.

Question 9

As you process a radiographic image of the abdomen of a small child,you notice a small ring-like object on the image.It appears this object is in the patient's stomach,which is consistent with the examination history.The ring shows on the X-ray image because of its metallic density.This is the result of

A) attenuation of the X-ray beam by the metallic density of the ring.
B) transmission of the X-ray beam through the soft metal of the ring.
C) electrons from the X-ray tube striking the patient.
D) scatter radiation from the patient.

Question 10

Sub-optimum mAs exposures in CR imaging technology will yield an image that is

A) grainy and demonstrates quantum mottle.
B) magnified and distorted.
C) minified and distorted.
D) overexposed and too dark to interpret.

Question 11

X-ray film imaging has been replaced by

A) computed radiography (CR).
B) direct and indirect digital detector technology.
C) digital radiography (DR)systems.
D) All of the above

Question 12

As you perform a portable chest radiograph,the optimal SID of 40 inches is unattainable because of orthopedic supports over the patient.It is necessary for you to shorten the SID to 34 inches.A professional radiographer should do which of the following?

A) Indicate the shorter SID on the examination notes to the radiologist.
B) Prop the patient up to increase the distance 6 inches from the image receptor.
C) Angle the tube cephalad to compensate for the shorter SID.
D) Use a shorter exposure time to improve resolution.

Question 13

Optimum radiographic image quality is a function of proper exposure technique selection.Given the three sets of mAs calculations that follow,all three should yield the same degree of radiographic exposure to a detector.
Exposure 1: 200 mA $\times$ 0.05 ms
Exposure 2: 100 mA $\times$ 0.10 ms
Exposure 3: 400 mA $\times$ 0.025 ms
This is known as

A) the inverse square law.
B) the kVp/mAs ratio.
C) mA/mAs proportionality.
D) mAs reciprocity.

Question 14

The resolution of an image using thin-film-transistor (TFT)technology is determined by the

A) size of the energy traps.
B) storage phosphor plate dimension.
C) detector pixel size.
D) the scanning frequency of the reader optics.

Question 15

The production of x-radiation that occurs in an X-ray tube requires the movement of negatively charged particles traveling from one side of the tube to the other.This movement of charges must occur in

A) an aqueous medium.
B) a vacuum.
C) a tungsten gas environment.
D) the subnuclear space.

Question 16

There are four primary image quality factors.They are

A) SID,mAs,SOD,and kVp.
B) primary radiation,scatter radiation,secondary radiation,and remnant radiation.
C) contrast,IR exposure or density,distortion,and recorded detail.
D) grids,collimation,filtration,and beam restriction.

Question 17

The total quantity of X-ray photons produced during an exposure is determined by the

A) kVp.
B) SID.
C) milliamperage (mA).
D) mAs.

Question 18

Of all of the energy traveling through the X-ray tube during a radiographic exposure,the largest percentage of this electrical energy is converted to

A) x-radiation.
B) infrared energy.
C) thermal energy (heat).
D) mechanical energy.

Question 19

All of the following are true of computed radiography (CR)except

A) it uses cassettes.
B) the image is recorded on an amorphous silicon imaging plate.
C) the active material in CR plates is barium fluorohalide.
D) the image plates are reusable.

Question 20

The X-ray tube component that stops the stream of electrons and produces the X-ray beam is called the

A) cathode.
B) anode.
C) tetrode.
D) positode.

Question 21

The dynamic display of a patient's anatomy using x-radiation is termed

A) fluoroscopy.
B) tomosynthesis.
C) image intensification.
D) real-time radiography.

Question 22

The loss of radiographic image resolution is often referred to as unsharpness.All of the following contribute to total image unsharpness except the

A) size and shape of the patient's anatomy.
B) pixel size of the image receptor (IR)and monitor display.
C) size and shape of the exposure field (collimation).
D) image geometry factors such as SID,OID,and focal spot size.

Question 23

An effective measure of actual exposure compared to a target exposure value is the use of a(n)

A) S number.
B) deviation index (DI).
C) exposure index (EI).
D) half-value layer.

Question 24

A very effective method for reducing your exposure to radiation during an exposure is to take advantage of distance.You can reduce your exposure by a factor of nine if you

A) double your distance.
B) triple your distance.
C) increase your distance according to the 15% rule.
D) increase your distance directly by a factor of nine.

Question 25

Computers and their software programs are essential to the processing of digital image data for digital X-ray images.This software can compensate for wide variances in radiation exposure to produce an image.Sub-optimum or excessive exposure is compensated for through a process referred to as

A) automatic rescaling.
B) automatic processing.
C) the 15% rule.
D) pixel value optimization.