RANDOM IMAGE PRODUCTION

Question 1

which term describes the same exposure to the image receptor if the same milliampere-seconds (mAs) is used, even if different milliampere (mA) and timer settings are used?

Answer 1

Exposure reproducibility

Question 2

what is the energy conversion principle in an x-ray imaging system?

Answer 2

Electrical energy is converted into electromagnetic energy

Question 3

which control can be used to accommodate slowly changing calibration or sensitivity of the exposure control AEC

Answer 3

Optical density

Question 4

what occurs if the filament in the x-ray tube gets vaporized?

Answer 4

ARCING= vaporization of the filament causes tungsten to coat the glass,resulting in ARCING.

Question 5

what is the consequence of a small amount of gas present inside an x-ray tube?

Answer 5

Generates more heat - a small amount of gas in the enclosure leads to the generation of more heat.

Question 6

what is the mean marrow dose ?

Answer 6

The average radiation dose to the entire active bone marrow

Question 7

which type of shielding can be manipulated to extend into the path of the beam during a radiologic procedure

Answer 7

shadow shielding - are mounted to the side of the collimator of the x-ray tube. It is manipulated to extend into the path of the beam and cast a shadow on the patient .

Question 8

which is the minimum kvp typically found on high -kvp technique charts

Answer 8

100 kvp

Question 9

which device senses the amount of radiation incident on the image receptor ?

Answer 9

Automatic exposure control

Question 10

grid

Answer 10

reduces the scattered radiation and allows the primary radiation to pass.

Question 11

three phase and high frequency generators

Answer 11

help to reduce the exposure time , but they do not help to sense the amount of radiation incident on the image receptor.

Question 12

For which projection might gonald shielding obscure essential anatomy for both males and females

Answer 12

the lateral inferosuperior hip

Question 13

which is the most important marker for limb projections

Answer 13

R and L

Question 14

which of these precautions should a radiologic technologist take control occupational radiation exposure during a fluoroscopic procedure?

Answer 14

1. use proper protective shielding 2. use proper lead curtains on the equipment 3. Step back from the table when assistance is not required

Question 15

which factor when decreased would minimize size distortion recorderd in a radiographic image?

Answer 15

Object to image receptor distance

Question 16

which devices are available in different sizes and are used for various age groups to shield male and female gonads during a radiographic examination ?

Answer 16

Flat contact shields

Question 17

identification is absolutely vital in what type of studies?

Answer 17

1. follow up studies 2. medicolegal cases 3. comparison studies

Question 18

what determines the contrast resolution of a digital imaging system?

Answer 18

BIT DEPTH- determines the number of gray levels that can be displayed by a digital imaging system , thus bit depth determines the contrast resolution

Question 19

which term protects a radiologic technologist from radiation

Answer 19

1. lead aprons 2. wraparound aprons

Question 20

which portion of the pixel face is sensitive to x-rays ?

Answer 20

FILL FACTOR- is the percentage of the pixel face that is sensitive to x-rays. the fill factor is 80 of the pixel face, with the remaining 20 percent dedicated to the reading and storage components.

Question 21

which type of device does a radiologic technologist place the side of the collimator of the x-ray tube on a flexible extension arm?

Answer 21

shadow shield

Question 22

Aperture ratio is a measure of what characteristic of liquid crystal displays ( LCDs)

Answer 22

image luminance - The portion of the pixel face that is available to transmit light is the aperture ratio.

Question 23

which component of a radiographic imaging system measures the quantity of radiation that reaches the image receptor ?

Answer 23

Automatic exposure control (AEC)

Question 24

which technical factor I controlled by automatic exposure control (AEC) ?

Answer 24

exposure time

Question 25

what type of radiographic technique charts is used most often in clinical practice?

Answer 25

Fixed kilovoltage techniques

Question 26

what should the difference be between the collimated light field and the actual area of exposure at a selected SID?

Answer 26

2 percent

Question 27

For pair production to occur , the energy of the incoming x-ray photons must be at least what?

Answer 27

1.02 Mev

Question 29

highest occupational exposure to radiation

Answer 29

c-arm mobile unit radiography

Question 30

who is responsible for re[porting equipment malfunctions and failures

Answer 30

radiologic technologist using equipment

Question 31

when using a fixed kvp radiographic technique charts approximately what kvp is appropriate for the soft tissue of the abdomen?

Answer 31

70 kvp

Question 33

which capture element is used in indirect digital radiography?

Answer 33

cesium iodide