Radiology Flashcards
The radiographic hallmark of hyperparathyroidism is?
subperisoteal resorption (PTH signals bone resorption)
decreasing the kilovoltage will have what predicted effect on contrast?
increase contrast
increasing kilovoltage by 15% will have what predicted effect on film density?
density is approx. doubled
1 Sievert (Sv) of radiation is equivalent to __ rems?
100 rems
osteoid osteomas are most frequently encountered in which foot bone?
talus
3 most common cystic lesions of the calcaneus?
bone cyst
intraosseous lipoma
aneurysmal bone cyst
what is the annual limit for whole body radiation?
50mSv (5.0 rem or 5000mrem)
“candle wax” hyperostosis- most likely diagnosis?
Meloreheostosis
Increasing the mA by 15% will have what predicted effect on contrast?
none
What parameter controls contrast?
kVP (“kuality)
What paramter controls density?
mAmp (amount) = quantity of photons
Decreasing the kilovoltage will have what predicted effect on contrast?
increase contrast
Increasing the kilovoltage by 15% will have what predicted effect on film density?
density is approx. doubled
KVP 15% rule
the most consistent radiographic feature in the long bones of a pediatric patient with acute lymphocytic leukemia (ALL) is?
transverse metaphyseal lucent banding
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?
acute hematogeneous osteomyelitis
Multiple phleboliths in the presence of a soft tissue mass is strongly suggestive of what pathologic lesion?
Hemangioma (or other vascular lesion)
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?
maximize SID whilst minimizing focal spot and OID
The wimberger ring (halo epiphysis) is classically encountered with which disorder?
Barlow’s dz or scurvy
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?
Acromegaly
Name two relatively non-agressive or benign bone tumors routinely found in the epiphysis.
giant cell tumor
chondroblastoma
“fallen fragment sign” is virtually pathognomonic for which lesion?
simple bone cyst
an endocrine disorder which typically manifests irreguar “stippled” epiphysis?
cretinism
“H” vertebrae. most likely diagnosis?
sickle-cell dz
