AIIMS 2019 Physics Medical Imaging MCQ Question
P.E.T. is positron emission tomography is a nuclear medicine functional imaging technique used to observe metabolic processes to diagnosis of disease.
F¹⁸ → positron + γ rays, used to detect cancer, heart prob. brain dis-order
F¹⁸ → positron + β rays, used to detect cancer, heart prob. brain dis-order
F¹⁸ → positron + α rays, used to detect cancer, heart prob. brain dis-order
F¹⁸ → positron + r rays, used to detect cancer, heart prob. brain dis-order
Correct Answer
Detailed Explanation
In positron emission tomography (PET), the isotope fluorine-18 (F¹⁸) undergoes beta decay, emitting a positron (β⁺) and a gamma ray (γ) as it transforms into oxygen-18 (O¹⁸). This process is crucial for detecting metabolic activity in tissues, making it valuable for diagnosing conditions such as cancer, heart problems, and brain disorders. Options A, C, and D are incorrect because they mistakenly refer to gamma rays, alpha rays, and an undefined "r rays," respectively, which do not accurately describe the emissions associated with F¹⁸ decay. Understanding the specific emissions involved in PET imaging is essential for grasping how this technique functions in medical diagnostics.
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