Positron Emission Tomography is a:-

AIIMS Manglagiri NO - 2019

Medical Surgical Nursing

Easy

Appeared in: AIIMS Manglagiri NO - 2019

Explanation

Positron Emission Tomography (PET) is a computer-based nuclear imaging technique that produces images of actual organ functioning.
It measures brain metabolism, blood flow, and tissue composition, thereby evaluating brain function indirectly.
The process involves injecting a radioactive tracer that emits positrons; the resulting gamma rays are detected by a scanner to create a composite picture of the brain at work.
This modality is particularly useful for showing metabolic changes in conditions like Alzheimer's disease, locating brain tumors or epileptogenic lesions, and assessing blood flow in stroke patients.

Option A: A neuropsychological test assesses cognitive and behavioral functions (e.g., memory, attention) through standardized tasks and questions, not through imaging of metabolic activity.
Option B: A neuro-endocrine test measures hormone levels and their effects on the nervous system. PET measures metabolic activity (like glucose uptake), not hormone concentrations.
Option C: An electrophysiological test, such as an EEG, measures the electrical activity of the brain. PET scans measure metabolic function by detecting gamma rays from a radioactive tracer, not electrical impulses.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Classification of Positron Emission Tomography (PET) as a diagnostic tool as background academic context rather than a clinical decision trigger.
Nurses play a key role in preparing patients for PET scans, which includes providing education, checking for allergies, assessing kidney function, and ensuring NPO status if required.
Understanding PET helps nurses interpret patient reports and explain procedures. For example, a 'hot spot' on a PET scan in an oncology patient often indicates a metabolically active tumor, guiding nursing care and patient education about the disease.
What if the patient had a pacemaker or metallic implant? While this is a major contraindication for MRI, it is generally not a problem for a PET scan. The nurse's role includes verifying compatibility for any imaging procedure.

How to Approach the Question

First, identify the core subject of the question: 'Positron Emission Tomography' (PET).
Recall or deduce the fundamental principle of a PET scan. The name itself gives clues: 'Tomography' implies imaging by sections or 'slices'. 'Positron Emission' points to its nuclear medicine basis.
Evaluate each option against the primary function of a PET scan.
Option A: 'Neuropsychological test' involves behavioral and cognitive tasks, not imaging. Eliminate this.
Option B: 'Neuro-Endocrine test' involves measuring hormones. PET measures metabolism. Eliminate this.
Option C: 'Electrophysiological test' measures electrical activity (like EEG). PET measures metabolic activity via radiation detection. Eliminate this.

Concept Tested & Keywords

Concept Tested: Classification of Positron Emission Tomography (PET) as a diagnostic tool.
Stem keywords: Positron Emission Tomography, PET
Lead-in keywords: is a

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