Diagnostic imaging

Question 1

what happens to the frequency as the wavelength decreases

Answer 1

it decreases

Question 2

which best describes ionizing electromagnetic radiation

Answer 2

it is characterized by the energy contained in a photon

Question 3

what are not properties of x rays?
a. they can penetrate living tissue
b. they can cause some substances to fluoresce
c. they can form a homogeneous beam that travels in wavy lines
d. they are electrically neutral

Answer 3

c

Question 4

in the diagnostic range most x rays are

Answer 4

bremsstrahlung radiation

Question 5

which of the following controls for the contrast on the radiograph
mAs
kV
SID
RAD

Answer 5

kV

Question 6

exposure factors for a thorax are 10 mAs and 60kV. the film density is too light and the technician wants to double the density which technique should be used

Answer 6

200mA 0.10 s 60kv
200*0.10= 20 mAs

Question 7

to minimize magnification and pneumbra a tech should … the source image distance and… the source object distance

Answer 7

increase, decrease

Question 8

the heel effect is going to be less noticeable with

Answer 8

larger film and shorter SID

Question 9

a radiograph of a dog’s pelvis measures 16cm in diameter. The tech manually processed the film for the required time and temp but it is too dark. What happened?

Answer 9

fast-speed screens were accidentally used instead of medium speed screens

Question 10

if a safelight illumination test in the darkroom involves processing the film, how should the film look if the safelight is functioning properly

Answer 10

evenly light-colored silver-gray

Question 11

how can a tech ensure that fresh chemistry is moved onto the film

Answer 11

agitation

Question 12

which best describes rare earth phosphors used today in intensifying screen

Answer 12

emit primarily in yellow-green spectrum

Question 13

which is the best view of the canine elbow

Answer 13

craniocaudal

Question 14

identify the correct peripheral borders for an elbow

Answer 14

one third of the radius or ulna and one third of the humerus

Question 15

what are the main tenets of technician safety when taking rads

Answer 15

min time, max distance, max shielding

Question 16

which technique will NOT help to obtain higher contrast on a film

Answer 16

increase the time and temperature of the chemicals

Question 17

what is the main purpose of developper

Answer 17

reduce exposed silver halide crystals to black metallic silver

Question 18

what is the key difference between computed radiography and conventional radiography

Answer 18

only computed radiography converts photons to metastable electrons

Question 19

a vet tech must perform a UGI study of a cat. the tech presents a series of rads taken at 0, 30, and 60min and a final at 90 min

Answer 19

the set is incomplete- it should have included a set taken at 15 min and hourly after the 90 min if requested

Question 20

in digital radiography which factor or element takes into account the frequency of appearance of a given object characteristic

Answer 20

histogram

Question 21

Which best describes the appearance of a hyperechoic lesion on ultrasound

Answer 21

brighter than surrounding tissue

Question 22

what is the advantage of using a 7.5MHz over a 5 MHz tranducer

Answer 22

detail is increased

Question 23

a doppler shift is best explained as a change in… as a result of motion

Answer 23

frequency

Question 24

which of the following occurs when the us beam interacts with a large curvilinear interface such as the diaphragm and liver border

Answer 24

mirror image

Question 25

a technician is preparing to do an us examination of a dog's abdomen, creating images in the transverse plane. Which image will this plane represent

Answer 25

ventrodorsal

Question 26

which description fits the appearance of normal adrenal glands on us

Answer 26

hypoechoic

Question 27

if a tech is preparing to take a sagittal image which way should the probe be oriented

Answer 27

cranial to caudal

Question 28

what organ is the most difficult to image and correlate sonographic appearance with the presence or absence of disease

Answer 28

pancreas

Question 29

which contributes to obtaining a clear sonographic image of the liver in a deep-chested dog

Answer 29

probe angled cranially at xiphoid process

Question 30

what are the five layers of the small intestine

Answer 30

mucosal surface, mucosa, submucosa, muscularis, serosa

Question 31

what condition would you prefer a CT to an MRI vertebral fracture, pericardial effusion, brain disorder, large vessel thrombus

Answer 31

fracture

Question 32

what is an accurate description of a solid lesion on us

Answer 32

contains many echoes which may be spread

Question 33

what is the purpose of a TCG slider

Answer 33

controls brightness in different depths of an organ

Question 34

which artifact occurs when there is minimal attenuation of the beam as it passes through a fluid-filled structure

Answer 34

through transmission artifact

Question 35

in abdominal ultrasonography in what two planes are the organs scanned

Answer 35

sagittal and transverse

Question 36

the normal size and shape of a cat adrenal gland is

Answer 36

4mm oval

Question 37

which organ is most associated with acoustic shadowing and reverberation artifact

Answer 37

colon

Question 38

which substance creates the greatest barrier to sound transmission

Answer 38

bone

Question 39

what is the best term for loss of intensity of the us beam as it travels through tissue

Answer 39

attenuation

Question 40

oms with nuclei that undergo radiation decay are known as

Answer 40

radionuclides