FA diagnostic imaging

Question 1

what does the wavelength/frequency of an ultrasound determine?

Answer 1

how well it penetrates tissue

Question 2

what are the three type of ultrasound machine head?

Answer 2

linear
convex
sector

Question 3

what are sector heads used for ultrasounding?

Answer 3

PD sheep abdomen (large contact area and image)

Question 4

what is an artefact due to reflection called?

Answer 4

reverberation

Question 5

what can reverberation be useful for?

Answer 5

determining the widest part of structures (follicles) - edges become brighter

Question 6

what is the best way to avoid artefacts due to refraction?

Answer 6

place the probe perpendicular to the object you are scanning

Question 7

what are the three outcomes of a dominant follicle?

Answer 7

ovulate
regress
form cyst

Question 8

where is the foetus of a cow found when ultrasound scanning?

Answer 8

same horn it ovulated from

Question 9

what can be seen in a pregnant uterus?

Answer 9

fluid
CL
fetus (heart beat)
placentomes

Question 10

what are the ways of foetal ageing?

Answer 10

crown-rump length
biparietal distance (head)
trunk diameter