TRIPHASIC TECH SCAN

Question 1

three phases of tri phasic scan?

Answer 1

“Window of vascular perfusion” – dynamic images - bulk of tracer is
intravascular; taken at 1 min

“Window of hyperemia” – Blood pool image - ECF content/hyperemia to
extremity; taken at 5 min

Delayed/Static stage – Taken after 4 hours

• 24 hrs delay - uptake in lamellar bone ends at 4 hrs. Woven bone
  (abnormal) continues for 24 hrs.

Question 2

Patients with PVD can have a 4th phase? T/F

Answer 2

T

Question 3

On triphasic scan, a +3, +3, +3 reading for the phases are characteristic of what?

What is +3, +3, +1 = ?

Answer 3

OM

cellulitis

Question 4

Triphasic bone scanning is the radionuclide procedure of choice for diagnosing OM
in absence of complicating factors.

Answer 4

T

Question 5

Why can’t bone scans be used to see if patient has post op infection?

Answer 5

Bone scans remain hot for 9-12 months post major bone trauma. (No longer a reliable
diagnostic tool)

Question 6

A normal (negative result) bone scan should rule out the probability of?

Answer 6

OM

Question 7

What is the efect of active sterile bone inflammation (recent fracture, diabetic foot, charcot, loose prosthesis) on scan?

Answer 7

Will see ↑ uptake in all 3 phases.