Nuclear Medicine exam Correct 100%

The physical half-life of a radionuclide is the time it takes A. For half of the substances to leave the body B. For the kit to become half expired C. For half of the substance to be metabolised D. For the nuclide to decay to one half of the original activity - ANSWERD. For the nuclide to decay to one half of the original activity Which of the following can be said regarding effective half-life? A. It is always longer than the physical half-life B. It is always shorter than physical half-life but longer than the biologic half-life C. It is always longer than the biologic half-life but shorter than the physical half-life D. It is always shorter than both the physical and the biologic half-life - ANSWERD. It is always shorter than both the physical and the biologic half-life Which of the following is not a desirable characteristic of radionuclides used for imaging? A. Photon energy between 50 to 500 keV B. Effective half-life long enough to permit imaging C. Low toxicity D. Particulate emission - ANSWERD. Particulate emission Convert 23mXI to SI units A. 850kBq B. 850Gbq C. None of the above D. 850MBq - ANSWERD. 850MBq In the event of a spill of 99mTc to clothes, one should immediately A. Enter a shower fully clothed B. Wash the clothes in hot water and then survey them to determine remaining activity C. Remove and store the clothes until they decay to background D. Remove and destroy the clothing - ANSWERC. Remove and store the clothes until they decay to background Which of the following measures absorbed doses? A. mCi B. gray C. becquerel D. all of the above - ANSWERB. gray The philosophy of the ALARA program is to keep the radiation dose A. As low as recently authorized B. As low as reasonably achievable C. As long as reasonably attained D. As long as reasonably acceptable - ANSWERB. As low as reasonably achievable Beta emitters are effective for therapy because A. They do not harm healthy tissue B. They can be used for imaging as well as for therapy C. They have a short range in soft tissue D. They have short half lives - ANSWERC. They have a short range in soft tissue What is the purpose of hydration and voiding after an injection for a bone scan? A. To reduce the radiation dose to the bladder B. To block the uptake of unlabelled technetium by the stomach C. To reduce the possibility of the urine contamination D. To obtain a superscan - ANSWERA. To reduce the radiation dose to the bladder Which one of the following is a malignant bone disease? A. Paget´s disease B. Osteomyelitis C. Osteoid osteoma D. Ewing sarcoma - ANSWERD. Ewing sarcoma What is not an indication for a bone scan? A. Metastatic disease B. Cellulitis C. Osteoporosis D. Avascular necrosis - ANSWERC. Osteoporosis A bone scan showing relatively uniformly increased skeletal uptake of radiopharmaceutical withalmost absent renal and bladder activity is usually referred to as a A. Superscan B. Flare phenomena C. Renal failure D. Suprascan - ANSWERA. Superscan What are common sites of bony metastasis? A. Pelvis B. Spine C. Ribs D. All of the above - ANSWERD. All of the above The advantage of bone scanning over plain radiography is / are? A. Efficient for multifocal trauma such as child abuse B. Bone must lose only a minimum of calcium content before lesions are visible on bonescintigraphy C. Time D. All(ExceptTime) - ANSWERD. All(ExceptTime) Which of the following agents will cross an intact blood brain barrier? A. 99mTc HMPAO B. 99mTC DTPA C. 99Tc GH D. 99mTC pertechnetate - ANSWERA. 99mTc HMPAO Which radiopharmaceutical is not commonly used for brain perfusion imaging with SPECT A. 99mTc HMPAO B. 99mTc DTPA C. 99mTc ECD D. All of the above - ANSWERB. 99mTc DTPA Akinesis refers to A. Diminished wall motion B. Paradoxical wall motion C. A lack of wall motions D. Septal motion - ANSWERC. A lack of wall motions Which of the following is not used to image the heart? A. 99mTc diphosphonate B. 20(T) chloride C. 99mTc sestamibi D. 99mTC RBCs - ANSWERA. 99mTc diphosphonate Myocardial ischemia is determined by A. Matching between myocardial oxygen supply and demand B. Coronary circulation is unable to couple with metabolic demand C. Anaemia D. Coronary stenosis 50% - ANSWERB. Coronary circulation is unable to couple with metabolic demand In an asthmatic patient, which of the following tests is contraindicated? A. Exercise stress test B. Dobutamine test C. Dipyridamol or adenosine test D. Hang-grip test - ANSWERC. Dipyridamol or adenosine test Dobutamine test should be used with caution in A. Patients with history of arrhythmias B. Patients with asthma C. Patients with chronic obstructive pulmonary disease D. Patients with silent ischemia - ANSWERA. Patients with history of arrhythmias In the early post-infarction period (3 days), which test is more indicated to assess residue ischemia? A. Exercise test B. Dobutamine test C. Dipyridamole or adenosine test D. Hang-grip test - ANSWERC. Dipyridamole or adenosine test Why is it necessary to inject two doses of 99mTc sestamibi for a myocardial perfusion study including both stress and rest conditions? A. Because there is no redistribution of 99mTc sestamibi within the myocardium B. Because the physical half-life of 99mTc is too short to obtain both image sets from oneinjection C. Because the effective half-life is too short D. Because sestamibi is not retained by the myocardium for a sufficient time - ANSWERA. Because there is no redistribution of 99mTc sestamibi within the myocardium What is the method of localization for the perfusion lung study? A. Capillary blockade B. Sequestration C. Compartmental containment D. Active sport - ANSWERA. Capillary blockade Increased risk of pulmonary embolism is associated with A. Smoking B. Use of oral contraceptive C. Recent surgery D. All of the above E. A and C only - ANSWERD. All of the above A perfusion lung scan shows a cold defect in the right base. If the ventilation study for the same patient is normal what is the most probable explanation for the defect? A. COPD B. Attenuation from the heart C. Pacemaker D. Pulmonary embolism - ANSWERD. Pulmonary embolism Which radiopharmaceutical is commonly used to image cavernous haemangioma? A. 99mTc IDA B. 99mTc pertechnetate C. 99mTc RBCs D. 99mTx sulphur colloid - ANSWERC. 99mTc RBCs Clearance of 99mTc MAG3 is by A. Active transport B. Glomerular filtration C. Tubular secretion D. None of the above - ANSWERC. Tubular secretion Indication for renal scanning with radionuclides include A. Asses local flow to transplanted kidneys B. Allergy to iodinated contrast C. Asses function of native kidneys D. Evaluation of space occupying lesions E. All of the above - ANSWERE. All of the above If after administrative of fluoride a patient will have activity in the renal calyces there is probably A. Collecting system obstruction B. Free renal function C. Renal artery occlusion D. Renal infarction - ANSWERA. Collecting system obstruction Preparation for captopril scintigraphy includes A. ACE inhibitors skipped B. Fasting to enhance absorption of oral captopril C. Well hydrated patient D. All of the above - ANSWERD. All of the above Captopril is used when A. The patient is suspected to having renovascular hypertension B. The patient is suspected to having an obstruction C. The patient has high blood pressure D. The patient is taking diuretics - ANSWERA. The patient is suspected to having renovascular hypertension 111 In pentetreotide is a A. Somatostain analogue B. Potassium analogue C. Monoclonal antibody D. Radiocfloid - ANSWERA. Somatostain analogue Examples of neuroendocrine tumours include A. Pituitary adenoma B. Small cell lung cancer C. Neuroblastoma D. Alltheabove - ANSWERD. All of the above The use of I-131 for thyroid imaging A. Is common if an uptake is also planned B. Delivers a lower radiation dose to the thyroid than does 99mTc pertechnetate C. Is typically only used when scanning the whole body for metastatic thyroid disease afterthyroidectomy D. All of the above -