اختبار: الأشعة البوزيتورنية A multiple-choice quiz consists of: 10 QuestionsQuestions are selected randomly from a collection of 17 questions. More Questions You will get deferent questions every time you take the quiz. Correct AnswersThere could be more than one correct answer, select all that apply.Skip QuestionsYou are allowed to scroll backward and forward before submitting your answers.10 MinutesThe quiz has a time limit. Time's up You can still submit your answers after the allowed period of time has ended . When ready, click Next to start the quiz. Name (Required) Email (Optional) Twitter (Optional) 1. F-18 FDG uptake in tumors correlates with tumor: Growth and viability. Size and contractility. Shape and reproducibility. Volume and stability. 2. The majority of radiation exposure to personnel performing PET/CT procedures comes from the: CT scanner Unopened dose pig PET scanner Injected patient 3. A 65-year-old patient is referred for a brain PET/MR study. The referring physician reports placement of a titanium alloy brain clips for an intracranial aneurysm 5 years ago. Which of the following would be the most appropriate action regarding imaging this case? Perform the study regardless the system type or field strength It is contraindicated to perform the exam as titanium alloy is ferromagnetic Perform PET only. Perform the exam using 0.5 Tesla systems or less 4. A patient is required to extend the arms above the head during a PET/CT scan. Which of the following is the possible reason? Reduces possible artifact formation Helps the patient to hold breath Maximizes extension of the spine Minimizes the patient's movement during the Scan 5. F-18 is a cyclotron-produced radioisotope with a half-life approximately of: 110 min. 119 min. 11 min. 101 min. 6. Which of the following radionuclides used in PET imaging produces the highest resolution images? Rb-82. F-18. C-11. N-13. 7. The term “partial volume effect” is caused by the limited resolution of PET scanners and refers to phenomenon that make intensity values in images differ from what they ideally should be. The “hot” spot smaller than twice the resolution of the scanner will have total counts preserved and will appear: Larger with a higher activity concentration Smaller with a lower activity concentration Smaller with a higher activity concentration Larger with a lower activity concentration 8. Localizing metastatic disease in thyroid cancer patients with F-18 fluorodeoxyglucose (FDG) PET imaging is the primary clinical indication if: I-131 whole body scan is positive and thyroglobulin (Tg) is positive. I-131 whole body scan is negative and thyroglobulin (Tg) is negative. I-131 whole body scan is positive and thyroglobulin (Tg) is negative. I-131 whole body scan is negative and thyroglobulin (Tg) is positive. 9. High glucose levels may interfere with tumor targeting due to competitive inhibition of FDG uptake by d-glucose. FDG-PET study should not be recommended when the glucose level in the blood exceeds: 175 mg/dl. 120 mg/dl. 155 mg/dl. 200 mg/dl. 10. The time from F-18 fluorodeoxyglucose (FDG) administration to the time of data acquisition has been shown to have a marked effect on FDG uptake. An increased interval between the injection and imaging uptake time will DECREASE radiotracer concentration in: Blood pool. Muscle. Tumor. Bone marrow. 1 out of 10 Time is Up! Time's up بواسطة ناصر المطيري|2021-09-20T14:26:18+03:00أبريل 15th, 2021|الأشعة البوزيترونية|لا توجد تعليقات شارك هذه الصفحة, واترك رأيك حول الموضوع باستخدام وسيلة التواصل التي تناسبك FacebookTwitterLinkedInWhatsAppPinterestEmail عن: ناصر المطيري كبير أخصائيي الطب النووي في مستشفى حفر الباطن المركزي و مؤسس موقع نيوكليرمد. اترك تعليقاًCancel reply
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