Crosswords week 2 ( digital fluoro)

Question 1

Period of time required for digital x-ray tube to switch on

Answer 1

Interrogation

Question 2

Type of dose rate measured in rads/hour

Answer 2

Absobed dose

Question 3

_____ progressive technology allows digital fluoro to keep pt. dose down

Answer 3

pulsed

Question 4

Period of time digital x-ray tube is energized

Answer 4

Duty cycle

Question 5

A computer reads information in ___ code

Answer 5

binary

Question 6

Common digital subtraction technique rendering anatomy opaque while highlighting vessels is known as ___?

Answer 6

road mappng

Question 7

Known to be a factor of one

Answer 7

quality factor

Question 8

barrier thickness is measured in mm of ____

Answer 8

Lead

Question 9

Rows & columns of pixels

Answer 9

Matrix

Question 10

SI unit for rem

Answer 10

Sievert

Question 11

Flat panel detector degrade with age, true or false?

Answer 11

false

Question 12

HVL is measured in mm of ____?

Answer 12

Aluminum

Question 13

Half value layer measures the ____ of the x-ray bem

Answer 13

Quality

Question 14

5 rem is the occupational dose limit of exposure for an individuals ______?

Answer 14

body

Question 15

Smallest element of digital image

Answer 15

pixel

Question 16

ADC turns electronic signal into _____ signal

Answer 16

digital

Question 17

Dose measured over a period of time

Answer 17

dose rate

Question 18

CCD turns ___ signal into electronic signal?

Answer 18

light

Question 19

Digital fluoro uses mA ___- than 100

Answer 19

greater

Question 20

Measurement of occupational dose limits

Answer 20

rem

Question 21

SI unit for rad

Answer 21

gray

Question 22

The higher the SNR the ____ the image noise

Answer 22

lower

Question 23

15 rem is the occupational dose limit of exposure for an individuals _____?

Answer 23

eye

Question 24

Image quality is improved as pixel size ____

Answer 24

decreases

Question 25

Measurement of absorbed dose

Answer 25

Rad

Question 26

Most I.I’s are of multi-field because ___?

Answer 26

They provide more flexabilty in all fluoro exams

Question 27

minification gain formula

Answer 27

(Input screen diameter )2 (over output screen diameter ) 2

Question 28

Describe the size of the image that arrives at the OP from the IP?

Answer 28

undistorted image in minified form

Question 29

What are the 2 methods of TV camera tube coupling?

Answer 29

Fiber optic cable & lens coupling

Question 30

When the multifocus image intensifier is operated in the magnification mode, where is the focal point relative to when the intensifier is in normal mode?

Answer 30

The focal point is closer to the input phosphor (IP) in mag mode

Question 31

The emission of electrons from an illuminated surface

Answer 31

Photoelectric emission

Question 32

1/10th of the value layer is needed during ____

Answer 32

HVL

Question 33

___ characterizes the quality of the beam

Answer 33

HVL

Question 34

Why is video viewing of the fluoroscopic image advantageous

Answer 34

The image is brighter

Question 35

TV monitoring allows for the storing ___ on ___ or____ for future playback.

Answer 35

image on disks or tapes

Question 36

Term for the misrepresentation of object size and shape on a radiograph

Answer 36

distortion

Question 37

Occupational dose for radiation worker is ?

Answer 37

5 rem / year

or 5000 mRem/ year

Question 38

Spatial resolution is measured in _____/

Answer 38

line pair per mm

Question 39

What are disadvantages of mirror optical systems

Answer 39

it is a one viewer system, significant amount of light loss from output phosphor

Question 40

True or false: Differential absorption increases when kVp decreases to obtain short scale images. This results in higher pt. dose

Answer 40

True