Radiology Review

Question 1

Reasons for Plain films

Answer 1

• diagnostic with no additional imaging required.
• preliminary image to plan for more specific imaging studies like CT or MRI.
• interpretation of other imaging procedures like V/Q lung scan.

e.g. fracture, chest x-ray

Question 2

plain films technology

Answer 2

high energy radiation waves

Question 3

reasons for CT

Answer 3

• finding location of pathology
• 3D reconstructions

e.g. sinusitis, trauma, cancer

Question 4

CT technology

Answer 4

xray + computer

Question 5

reasons for MRI

Answer 5

brain tumor, knee joint injury, spinal cord compression

Question 6

MRI technology

Answer 6

strong magnet, radio waves, computer

Question 7

reasons for ultrasound

Answer 7

• simple/painless way to examine structures

ectopic pregnancy, DVT

Question 8

ultrasound technology

Answer 8

high frequency sound waves, computer/real time image

Question 9

reasons for nuclear medicine

Answer 9

evaluate function of an organ

e.g. parathyroid adenoma, bone scan

Question 10

nuclear medicine technology

Answer 10

radioactive substance administered inside the body

Question 11

angiogram reasons

Answer 11

• best picture of arteries
• rarely done (replaced by MRI/CT)

e.g. aneurysms, embolisms, diabetes (eye)

Question 12

angiogram technology

Answer 12

catheter in femoral/brachial artery, contrast, x-ray

Question 13

3 darkest items on x-ray and CT

Answer 13

air, lung, soft tissue

Question 14

4 medium items on x-ray/CT

Answer 14

fat, water, CSF, blood

Question 15

3 bright items on xray/CT

Answer 15

muscle, calculus (calcification), bone

Question 16

What organs enhance when intravenous contrast is given for MRI or CT

Answer 16

solid organs like liver and kidney enhance or get brighter on CT and MRI when intravenous contrast is given

Question 17

what is hyperechoic on an ultrasound?

Answer 17

hyperechoic= white= calcium, air, fat

Question 18

is fluid bright or dark on MRI?

Answer 18

bright!

Question 19

imaging procedure of choice with head trauma

Answer 19

CT

Question 20

imaging procedure of choice for a skull lesion

Answer 20

CT- provides the best evaluation of bone

Question 21

bone appears ___ on MRI

Answer 21

dark

Question 22

bone appears ___ on CT

Answer 22

bright

Question 23

the term density is used with

Answer 23

CT (attenuation value is measured in Hounsfield unit (HU))

Question 24

the term signal intensity is used with

Answer 24

MRI

Question 25

which takes longer- MRI or CT

Answer 25

``` MRI= 30 minutes CT= 30 seconds ```

Question 26

which contrast is used in CT

Answer 26

Iodinated contrast- can cause allergies

Question 27

which contrast is used in MR

Answer 27

Gadolinium- can impact renal function

Question 28

T1 vs T2 width MRI

Answer 28

CSF is bright in T2 wtd MRI and CSF is dark in T1 wtd MRI

Question 29

to find the location of a pathology, you would order a

Answer 29

CT

Question 30

to evaluate the function of an organ you would use

Answer 30

nuclear medicine