Nuclear Medicine Exam Study Guide With Verified Solutions.

Nuclear Medicine Exam Study Guide With Verified Solutions. Gallium-67 dose? Gamma energies? Half-life? Time to imaging? - answer5 mCi (inflam). 10 mCi (tumor). 93, 184, 296, 388 keV. 78 hrs. 6, 24 (inflam). 48-72 (tumor). Gallium-67 mechanism of uptake? - answerFe analog via transferrin. Gallium-67 Normal distribution? - answerLiver spleen, marrow, bone. Variable: breast, bowel, salivary glands, lacrimal glands. I-131 dose? Gamma energies? Half-life? Time to imaging? - answer2 mCi. 364 keV. half- life 8 days. 48 hrs. I-131 mechanism of uptake? - answerIodine. Thyroid uptake,TSH-mediated I-131 Normal distribution? - answerStomach, GI, bladder. Variable: salivary, nasopharynx, I-131 MIBG dose? Gamma energies? Half-life? Time to imaging? - answer2 mCi. 364 keV. 8 days. 48 hrs. I-131 MIBG mechanism of uptake? - answerGuanethidine analog. Norepinephrine reuptake. I-131 MIBG normal distribution? - answerLiver spleen. Variable: salivary, lung, GI, bladder, skeletal muscle, heart. I-123 MIBG dose? Gamma energies? Half-life? Time to imaging? - answer1-10 mCi. 159 keV. 13 hrs. 24 hrs. I-123 MIBG normal distribution? - answerLiver spleen. Variable: salivary, lung, GI, bladder, skeletal muscle, heart. In-111 octreoscan dose? Gamma energies? Half-life? Time to imaging? - answer6 mCi. 172, 247 keV. 67 hrs. 4, 24 hrs. Octreoscan mechanism of uptake? - answerSomatostatin analog. Neuroendocrine tumors. In-111 octreoscan normal distribution? - answerIntense renal cortex. Spleen, liver, pituitary, salivary, GI, bladder. Variable: breast, thyroid. FDG-PET dose? Gamma energies? Half-life? Time to imaging? - answer10-15 mCi. 511 keV. 2 hrs. 1 hr. FDG-PET mechanism of uptake? - answerGlucose analog. Active transport into cell. Phosphorylated and trapped. FDG-Pet normal distribution - answerIntense urinary activity and cerebral cortex. GU, liver, spleen, marrow. Variable: thyroid, cardiac, GI, muscle. In-111 WBC dose? Gamma energies? Half-life? Time to imaging? - answer0.5 mCi. 172, 247 keV. 67 hrs. 24 hrs. In-111 WBC mechanism of uptake? - answerWBC localized at infection. In-111 WBC normal distribution? - answerSpleen Liver marrow. No renal or GI activity. Tc-99 WBC dose? Gamma energies? Half-life? Time to imaging? - answer20 mCi. 140 keV. 6 hrs. 1-4, 24 hrs. Intense cardiac activity radiotracer? - answerMIBG. PET. Intense spleen activity radiotracer? - answerWBC. Intense renal activity radiotracer? - answerOctreotide. Lacrimal activity? - answerGallium-67. For about __ months after hip replacement surgery, the bone around the prosthesis is expected to have increased osteoblastic activity. - answer6 months. Refers to a hot spot at the tip of a prosthesis and two areas of increased uptake at the proximal end. - answerToggle sign. Prosthetic loosening. Three phases of bone scan osteomyelitis? - answerFirst phase: Early arterial flow, seconds after injection. Second phase: Blood pool, few minutes after injection.Third phase: Bone labeling, 3 or more hours after injection. All three positive in infection. Contraindications to perfusion lung scanning include - answerSevere pulmonary hypertension. Allergy to human serum albumin products. Common indication for V/Q scans - answerSuspected PE. Preoperative estimates of lung function. To evaluate right-to-left shunts. Serial assessment of inflammatory lung disease. When should a V/Q scan be ordered over CTA? - answerLow clinical probability. Normal CXR is normal. Pregnant patient. Contraindication to iodinated contrast. Normal ventilation scans - answerHomogeneous radiopharmaceutical distribution throughout both lungs on all three phases: Initial breath. Equilibrium. Washout.