Radiology

Question 1

The radiographic hallmark of hyperparathyroidism is?

Answer 1

subperisoteal resorption (PTH signals bone resorption)

Question 2

decreasing the kilovoltage will have what predicted effect on contrast?

Answer 2

increase contrast

Question 3

increasing kilovoltage by 15% will have what predicted effect on film density?

Answer 3

density is approx. doubled

Question 4

1 Sievert (Sv) of radiation is equivalent to __ rems?

Answer 4

100 rems

Question 5

osteoid osteomas are most frequently encountered in which foot bone?

Answer 5

talus

Question 6

3 most common cystic lesions of the calcaneus?

Answer 6

bone cyst
intraosseous lipoma
aneurysmal bone cyst

Question 7

what is the annual limit for whole body radiation?

Answer 7

50mSv (5.0 rem or 5000mrem)

Question 8

“candle wax” hyperostosis- most likely diagnosis?

Answer 8

Meloreheostosis

Question 9

Increasing the mA by 15% will have what predicted effect on contrast?

Answer 9

none

Question 10

What parameter controls contrast?

Answer 10

kVP (“kuality)

Question 11

What paramter controls density?

Answer 11

mAmp (amount) = quantity of photons

Question 12

Decreasing the kilovoltage will have what predicted effect on contrast?

Answer 12

increase contrast

Question 13

Increasing the kilovoltage by 15% will have what predicted effect on film density?

Answer 13

density is approx. doubled

KVP 15% rule

Question 14

the most consistent radiographic feature in the long bones of a pediatric patient with acute lymphocytic leukemia (ALL) is?

Answer 14

transverse metaphyseal lucent banding

Question 15

An adolescent patient presents with ankle pain and swelling and a radiographic pattern of serpigionous pattern of internal osteolysis. This pattern is virtually pathognomnic for?

Answer 15

acute hematogeneous osteomyelitis

Question 16

Multiple phleboliths in the presence of a soft tissue mass is strongly suggestive of what pathologic lesion?

Answer 16

Hemangioma (or other vascular lesion)

Question 17

in considering focal spot size, source-image distance (SID) and object-image distance (OID), what must be done to each factor to insure a maximally sharp xray image?

Answer 17

maximize SID whilst minimizing focal spot and OID

Question 18

The wimberger ring (halo epiphysis) is classically encountered with which disorder?

Answer 18

Barlow’s dz or scurvy

Question 19

You see pseudoforamina formation on almost all of the distal phalanges on an AP radiograph, what systemic disorder is high on the list of differentials?

Answer 19

Acromegaly

Question 20

Name two relatively non-agressive or benign bone tumors routinely found in the epiphysis.

Answer 20

giant cell tumor

chondroblastoma

Question 21

“fallen fragment sign” is virtually pathognomonic for which lesion?

Answer 21

simple bone cyst

Question 22

an endocrine disorder which typically manifests irreguar “stippled” epiphysis?

Answer 22

cretinism

Question 23

“H” vertebrae. most likely diagnosis?

Answer 23

sickle-cell dz