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Flashcards in Final Deck (58)
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1

uses x-rays to present image slices

CT

2

calculates x-rays ability to pass through or be weakened by tissues

attenuation coefficients

3

advantage of CT

3-D imaging

4

each image square

pixel

5

elongated block of tissue

voxel

6

CT thickness determined by..

computer programming

7

pioneer of CT imaging

Godfrey Hounsfield, 1979

8

what determines Hounsfield units (HU)?

x-ray attenuation coefficient

9

imaging of choice for head trauma and cerebrovascular events

Head CT axial slices

10

lymphoma and head/neck neoplasms

Neck CT + C

11

most helpful for coronal and sagittal planes

MRI

12

fat looks bright

T1 MRI

13

water looks bright

T2 MRI

14

for visualizing normal anatomy

T1

15

used to detect disease process

T2

16

allows spatial encoding of the MRI signal and is critical for a wide range of "physiologic" techniques

gradients

17

receive and transmit signal

patient coils

18

"atenna" of MRI system

radiofrequency (RF) coils

19

MRI study is susceptible to

motion artefacts

20

Dx infections, tumors, vascular pathology

intravenous contrast administration

21

Dx of internal joint derangement

MR arthrography

22

detect thromboembolic disease

MRA and CTA

23

uses gadolinium enhanced contrast medium

MRI (T1)

24

uses iodinated contrast medium and greater x-ray absorption

CT

25

may cause nephrogenic systemic fibrosis (NSF)

gadolinium

26

gradual fibrosis of skin/internal organ

NSF

27

uses FDG to find malignancies

positron emission tomograhy (PET)

28

electrical energy converted to burst of high frequency sounds waves (1-10) which are reflected by tissues

ultrasonogrophy (US)

29

uses Tc99-methylene diphosphate as active agent

radionuclide bone scan

30

3 phases of bone scans?

1. inflow (2-5 s)
2. tissue pool (5-15 min)
3. delayed (2-4 hours)