CORRECT Answers
Which of the following is a malignant bone disease?
B Ewing's Sarcoma
(a) Paget's disease
Ewing's sarcoma is a type of cancer most often found in
(b) Ewing's sarcoma
children and young adults and is more common in males
(c) Osteomyelitis
than females.
(d) Osteoid osteoma
What is the purpose of a reducing agent in a 99mTc
diphosphonate kit?
d) Both (b) and (c)
(a) To oxidize technetium
(b) To lower the valence state of technetium
Stannous chloride reduces the valence state of tech-
(c) To improve the tag eflciency (
netium, thereby improving the tag eflciency.
d) Both (b) and (c)
(e) (a), (b), and (c)
d) Both (a) and (b)
The presence of free pertechnetate on a bone scan may
be the result of:
Free pertechnetate demonstrated as gastric, salivary, and
thyroid activity on bone scans may be the result of admin-
(a) The use of a radiopharmaceutical which was prepared
istering a dose from *a kit that has been prepared more
too long ago
than 4 h prior to injection*.
(b) Introduction of air into the kit vial while adding tech-
netium
Additionally, *if air* has been introduced into the re-
(c) Increased blood flow to bones
action vial during labeling, there may be a poor tech-
(d) Both (a) and (b)
netium-phosphate tag
(c) During injection, immediately following injection, 2-4
What timing protocol best describes a four-phase bone
scan?
(a) During injection, immediately following injection, 2-4
h, and 18-24 h
(b) During injection, 2-4 h, 24 h, and 48 h
, (a) During injection, immediately following injection, 2-4
h, and 18-24 h
The fourth phase of imaging is usually completed
approx-imately 24 h following injection; therefore,
choices (b) and
(c) are incorrect.
2/5