Image Modalities

Question 1

Scintigraphy

Answer 1

IV injection of radioactive material

Question 2

which method of imaging involves no ionizing radiation?

Answer 2

MRI

Question 3

Which method of imaging uses x-rays and computer to produce images with cross sections of anatomy?

Answer 3

CT

Question 4

Which injectable contrast is used during MRI studies?

Answer 4

Gandolinium

Question 5

What is the Hounsfield radiodensity unit of air?

Answer 5

-1,000 HU

Question 6

Which diagnostic tests use bursts of gamma protons to identify areas of injury?

Answer 6

Scintigraphy

Question 7

insufflation during endoscopy is generally performed using

Answer 7

CO2

Question 8

Why is insufflating when using an endoscope important?

Answer 8

opens up the lumen, allowing for better inspection and navigation

Question 9

When is a rigid endoscope generally used?

Answer 9

for structures that aren’t tubular

Question 10

the MRI affects ____ in the body to produce a picture

Answer 10

Protons

Question 11

Anechoic

Answer 11

do not generate an echo from US waves

Question 12

hypoechoic

Answer 12

little returning echo - appears dark gray

Question 13

hyperechoic

Answer 13

high-intensity returning echo, very bright on US image.

Question 14

what causes comet tail artifact?

Answer 14

sound waves interact with metal objects

Question 15

which ultrasound technique is commonly used in echos?

Answer 15

M-mode

Question 16

Attenuation

Answer 16

loss of amplitude of US waves

Question 17

what range of frequencies is most often used for small animal ultrasound?

Answer 17

2-15 MHz

Question 18

which US control modulates the amount of contrast to the image?

Answer 18

Dynamic range control

Question 19

Which control allows the US image to be modified so inherent brightness of superficial structures is minimized?

Answer 19

time-gain compensation

Question 20

What are the types of transducers?

Answer 20

• sector array
• linear array
• curvilinear array
• phased array
• annular array

Question 21

What is the most commonly used display mode?

Answer 21

B-mode

Question 22

what is myelography used to evaluate?

Answer 22

spinal cord

Question 23

What positive contrast is not diluted by secretion or absorbed through intestines?

Answer 23

Barium sulfate

Question 24

which contrast study views the kidney structure and collection systems?

Answer 24

excretory urogram

Question 25

what contrast is used for suspected perforation of the small bowel?

Answer 25

Triiodinated compound

Question 26

What is the best contrast procedure for the urinary bladder mucosa?

Answer 26

double-contrast cystography

Question 27

what media should be used for radiolucent bladder stones?

Answer 27

Ionic organic iodides

Question 28

What are 4 types of contrast agents, and which one is negative?

Answer 28

• soluble ionic radiopaque media
• soluble nonionic radiopaque media
• insoluble inert radiopaque media
• radiolucent gases - this one is negative

Question 29

what types of radiolucent gases are used in vet med?

Answer 29

air, o2, co2, and nitrous oxide.

Question 30

When is myelography used?

Answer 30

when MRI and CT are unavailable

Question 31

dose creep

Answer 31

increases in exposure factors to reduce the amount of image noise

Question 32

what causes ghosting

Answer 32

incomplete erasure of the imaging plate

Question 33

how much of the image on an imaging plate will be lost in 8 hours?

Answer 33

approx 25%

Question 34

What type of cassette screen is used in computed radiography?

Answer 34

a screen composed of photostimulable phosphors