Overview of diagnostic imaging Flashcards Preview

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Flashcards in Overview of diagnostic imaging Deck (20):
1

What do x-rays show?

Variations in physical density

2

Physical basis - scintigraphy

Gamma rays

3

Scitigiraphy shows

Metabolic activity (i.e. physiologic not structural)

4

MRI - physical basis

Radiowaves

5

MRI - shows ?

Magnetisation

6

Ultrasound - physical basis?

High frequency sound

7

Ultrasonogrpahy shows?

Echogenicity

8

Uses - radiography - 3

Bone, pulmonary and abdominal gas

9

Spectrum of white/black - xrays

Bone>soft tissue>fat>airway

10

Define tomography

Making images that represent a section through the body

11

Define scitigraphy

Making images representing the distribution of radioactivity injected into a patient (radiopharmaceutical injection into jugular). Carcinomas cause 'hotspots' of metabolic activity

12

How do you make MRI images?

Applying pulsed magnetic energy to the patient and collecting radiowaves that are emitted between pulses.

13

Uses - MRI in animals

Predominantly for neurological problems. Shows brain in much more detail than CT. Fat shows up as white.

14

Define ultrasonograpy

Making images by firing pulses of high frequency sound into the body and collecting the returning echoes.

15

Is the spleen or liver more hyperechoic?

spleen (more echoes return from spleen than liver).

16

Appearance of urine on ultrasound?

Black (no echoes)

17

Uses - ultrasonography

-visualise internal vessels and gall bladder of liver
-differentiate bladder, lumen, prostrate and urethra
-determine if peristalsis in GIT is normal

18

Common indicated for imaging

Owener's view of problem -->refine problem --> system affected --> structural lesion (location) --> investigation may involve imagine (investigation less likely to involve imaging if a dysfunction is suspected)

19

Result of diagnostic imaging =?

Description of the gross morphological features of a condition. Sometimes these are characteristic of a specific disease. Often further tests (biopsy) are required for a definite diagnosis. Predominantly to aid diagnosis, may also be used to guide biopsy or facilitate treatment

20

Appearance of a CT image

Reverse colours to radiography (bones = black, lungs = white)

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