Imagining procedure Intro part 2 Flashcards
Name the mc isotope/radiopharmaceutical comment used to emit radiation during bone scan (scintigraphy)?
Technetium-99m
The second company (methylene diphosphonate) has an affinity for bone
In radionuclide scanning, what organ systems have a selective uptake of radiopharmaceutical (radioisotope)
skeleton, thyroid, heart, lung, kidneys, brain
Bone scintigraphy is extremely ___ but lacks ___.
What is a “hot spot”? Note: bone scans helps determine if bone activity is local or spread
sensitive, specificity
increase bone formation and metabolic activity usually osteoblastic activity Ex: fx, tumors, infections, endocrine, hematologic and arthritic disorders
Areas of normal update are
long bone metaphysics thyroid kidneys - pass via urine sternum* spine S.I. bladder
What are indications for bone scan?
ID occult fx/stree fx screen for mets disease SPECT scans useful for active pars lesions osteonecrosis infection injection site
Signal emitted by MRI is what?
H+ nuclei, signal strength based on liquidity of tissue
The liquidity high signal brightness seen on MRI shows fat and stagnant blood on what pulse sequence?
T1
MRI T2 has a high signal for what?
water, fat and pathology
MRI’s are good for evaluating
ST, bone marrow, disc, ligaments
NOTE: no ionizing radiation
What are the contraindications for MRI?
claustrophobia, metallic clips, pacemakers (2011 after more comparable for MRI)
The dynamics of MRI summarized in what 4 steps?
Resting, Magnetism, Excitation and Relaxation
On MRI cortex is
hyper intense aka dark
bright white on CT/plain film
What contrast study is invasive and combined with MRI
Arthrography
What are the two types of contrast studies?
arthrogrphy and
angiography (used with fluoroscopy and CT)
What contrast study is used if MRI is not possible?
myelography and CT myelography
