Circulatory imaging Flashcards Preview

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Flashcards in Circulatory imaging Deck (11):
1

different imaging dependent on function?

Anatomical:
-CT
-Ultrasound
-Plain films

Functional:
-MRI
-Ultrasound
-radionuclide

2

Contrast agents necessary features

-safe
-effective
-easy to use
-similar attenuation to surroundings
-cheap
-equally distributed in the body

3

Iodine contrast features

-cheap
-easy to use
-stable

4

Iodine contrast side effects

-rarely nausea
-renal impairment- especially in patients who have liver problems and are on metformin
-thyroid problems
-clotting
-seizures
-asthma
-pulmonary oedema
-metallic taste
-feeling of warmth

5

Catheter Angiography

-Sterile procedure
-No radionuclide
-contrast contains not just iodine so not as bad for patients with renal problems
1-insert catheter into vessel
2-contrast injected through pump injector
3-takes a series of rapid photographs

6

Angioplasty

-can occur immediately when angiography takes place
- not as long lasting as surgery
-used for stenosis
-problems: embolisation, rupture, occlusion

7

Ultrasound features

-non- invasive
-no radionuclide
-easy
-operator dependant

8

Doppler
B-mode
M-mode

Doppler: high frequency sound waves used to measure blood flow through the arteries and the veins
B-mode: brightness increases we the amplitude and frequency of the echo increases
M-mode: allows the movement of a body structure to be observed. monitor the distance repeatedly for a single transducer.

9

CT angiography

-need good patient complaince
-only possible through IV contrast
-uses radionuclide

10

MRI angiography

-used high frequency magnetic fields
-expensive
-sensitive
-cannot be used in patients with pacemakers

11

Radionuclide imaging

-used for blood loss
-need good patient compliance
-non-specific