Quiz3 Wed

Question 0

Spin top test (half wave)

Answer 0

•time x 60= # of dots

Question 1

Spin top test

Answer 1

• disk with hole exposure is made while top is spinning

* used to test timer

Question 2

Spin top test (full wave)

Answer 2

Time x 120= # of dots

Question 3

Spin top (three phase)

Answer 3

• can’t be used

* must use synchronized timer

Question 4

Wire mesh tool

Answer 4

•used to check for screen film contact

Question 5

Does the temperature of the developer effect density?

Answer 5

• yes
• to hot= too dense “overexposed”
• to cold= less dense “underexposed”

Question 6

Processing artifact which looks like lightning or trees?

Answer 6

•static- static discharge from low humidity

Question 7

Field size increases as

Answer 7

•SID increases

Question 8

If distance is halved then mAs is

Answer 8

•1/4 the original

Question 9

Geometric unsharpness is due to

Answer 9

• focal spot
• SID
• OID

Question 10

Subject unsharpness is due to

Answer 10

• patient thickness
• tissue density
• object shape

Question 11

Xray & light field congruence

Answer 11

• must be within 2% of SID

* test tool or coin is used if off adjust mirror

Question 12

If SID is outside the grid radius what is the result

Answer 12

•grid cutoff

Question 13

Reproducibility

Answer 13

•Output radiation intensity should be constant from
One exposure to the next
•should not vary more than 5%

Question 14

Linearity

Answer 14

• same mAs settings with different mA & time should be same output
• should not exceed 10%

Question 15

If u can’t get part close to the imaging plate what can u do to decrease blur & magnification

Answer 15

• increase SID

* use small focal spot

Question 16

How do u determine resolution in digital

Answer 16

• Matrix size

* the more pixels the more resolution

Question 17

What has larger latitude/linear, film or digital

Answer 17

•digital

Question 18

Quantum mottle (digital)

Answer 18

• not enough radiation hitting the IR

* underexposed

Question 19

Exposure index

Answer 19

• amount of radiation reaching the receptor
• determines over or under exposure
• median 200 higher number is underexposed.

Question 20

Conventional tomography is based on the theory of

Answer 20

•controlled blurring

Question 21

Conventional tomography tube and film move in

Answer 21

•opposite directions

Question 22

Fulcrum point

Answer 22

• Point of motion

* pivot point

Question 23

What determines thickness of tomo cut

Answer 23

• angle of arch
• sm. angle thick cut
• lrg. angle thin cut

Question 24

What shows a change in frequency when turbulent flow is detected

Answer 24

•Doppler

Question 25

Ultrasound transducer piezoelectric effect

Answer 25

•when certain crystals have an electric current applied they vibrate

Question 26

What has the thinnest tomo cuts

Answer 26

•hypocycloidal less than 1mm

Question 27

Fulcrum height

Answer 27

•adjust up or down to move focal plane

Question 28

PACS

Answer 28

•Captures, stores, transports, & catalogs images