Radiography: Equipment Operation

Question 1

__________________ is an electric device used to convert alternating current into direct current by allowing a current to flow in only one direction.

Answer 1

A rectifier

Question 2

Which 3 components are essential in order for X-ray tubes to function?

Answer 2

A vacuum-sealed glass/metal envelope, an electron source (cathode), and target material (anode)

Question 3

What type of motor is used with X-ray tubes?

Answer 3

An induction motor

Question 4

___________________ refers to the number of X-rays or the intensity of the X-ray beam.

Answer 4

**Radiation quantity **

Question 5

An X-ray tube current is controlled through a separate circuit called the ______________.

Answer 5

filament circuit

Question 6

What part of the collimator absorbs the X-ray beam?

Answer 6

Lead shutters

Question 7

What type of X-ray generator features the exposure beginning at the maximum mA with the mA dropping as the anode heats?

Answer 7

A falling load generator

Question 8

A vacuum tube with 2 electrodes, a cathode and an anode, is also called ______________ .

Answer 8

**a diode **

Question 9

What is the main reason inherent filtration or added filtration are used?

Answer 9

**To decrease patient dose **

Question 10

One side of an X-ray beam is stronger because some of the radiation created in the X-ray tube is absorbed by ________________ .

Answer 10

the anode

Question 11

The console of a radiographic imaging system usually DOES or DOES NOT allow control of added filtration?

Answer 11

Does not

Question 12

The most powerful X-ray that emerges from the X-ray tube is controlled by what setting?

Answer 12

kilovoltage peak (kVp)

Question 13

What is directly proportional to receptor exposure?

Answer 13

**Milliampere seconds (mAs) **

Question 14

When the primary X-ray beam passes through tissue, photons interact with the anatomy, and the beam’s energy is reduced, which is a process known as __________________ .

Answer 14

**attenuation **

Question 15

The ratio of the number of light photons emitted by the output phosphor in an image intensifier tube to the number of X-rays striking the input phosphor is called __________________ .

Answer 15

**flux gain **

Question 16

When using an image intensifier, the brightness gain can be calculated by ___________________ .

Answer 16

**multiplying the flux gain times the minification gain **

Question 17

The component of an image intensifier tube that converts the photoelectrons into visible light is called _____________________ .

Answer 17

**the output phosphor **

Question 18

In an image intensifier, the _____________________ converts visible light into a photoelectrons.

Answer 18

**photocathode **

Question 19

In an image intensifier tube, __________________ is where electrons interact and produce light.

Answer 19

the output phosphor

Question 20

__________________ is a characteristic of an image intensifier and appears as reduced brightness and contrast toward the periphery of the resulting image.

Answer 20

Vignetting

Question 21

The fluoroscopic exposure rate may not exceed _________________ .

Answer 21

100 mGya per minute

Question 22

The cathode assembly is made up of 2 primary parts, which are ________________ and _________________.

Answer 22

a filament and a focusing cup

Question 23

The anode components of an X-ray tube rotate at a high rate per minute in order to ____________________

Answer 23

**dissipate heat **

Question 24

The rows and columns of pixels displayed on a digital image is _____________________ .

Answer 24

**the matrix **

Question 25

__________________ is a graph that reflects how many pixels of each brightness appear on an X-ray image, where the horizontal axis is brightness, and the vertical axis is the number of pixels.

Answer 25

A histogram

Question 26

At the end of an imaging cycle, the photostimulable phosphor plate from a computed radiography system is erased using ______________________ .

Answer 26

a high-intensity white light

Question 27

What is the function of a scintillator in a flat-panel digital receptor?

Answer 27

to absorb X-ray photons and emit light photons

Question 28

The digital signal created by a charge-coupled device type of digital imaging receptor is created through _____________________ .

Answer 28

**light photons from the scintillator **

Question 29

Which type of generator produces the highest number of X-rays for the same exposure technique?

Answer 29

A high-frequency generator

Question 30

With three-phase power, the voltage applied across the X-ray tube is mostly constant and never drops below ________ during imaging.

Answer 30

0

Question 31

In an imaging display, the brightness function is adjusted by the___________________.

Answer 31

**window level **

Question 32

What are the 4 main components of every Picture Archiving and Communication System (PACS)/Medical Image Management and Processing System (MIMPS)?

Answer 32

The image acquisition system, the display system, the network, and the storage system.

Question 33

The international standard for the storage, formatting, and transmission of digital medical images and the communication of these images from one software system to another is called ___________________

Answer 33

Digital Imaging and Communications in Medicine (DICOM)

Question 34

X-ray tube filaments are usually made of ___________________.

Answer 34

**thoriated tungsten **

Question 35

What are the 2 types of anodes available in an X-ray tube?

Answer 35

Rotating and stationary