NUCMED-MARCH-6

Scintillation Camera

An imaging device that uses a scintillation detector to capture gamma rays emitted from radiopharmaceuticals, providing images of functional processes in the body.

Photopeak window

The range of energy levels where the scintillation camera detects gamma photons, used for evaluating camera performance.

Field uniformity

The ability of the scintillation camera to reproduce a uniform distribution of activity across the imaging field.

PMT

Photomultiplier Tube, a light-sensitive device used in scintillation cameras to amplify light from the scintillation process.

Nonuniformity

Variations in the camera response or image quality that lead to discrepancies in the images produced, particularly when exceeding ±5% from the mean.

57Co

Cobalt-57, a radioactive source used for checking field uniformity in scintillation cameras.

Quadrant bar phantom

A test object used to evaluate the resolution of a scintillation camera by measuring the ability to resolve closely spaced lines.

Dose calibrator

An ionization chamber device used to measure the radioactivity of a radioisotope dose before administration to a patient.

Constancy check

A daily verification process ensuring that the dose calibrator consistently measures the same reference source.

Quantum mottle

A type of random noise in nuclear medicine images that arises from statistical variations in counts due to low photon numbers.

Target to background ratio

The ratio of activity detected in the organ of interest compared to unwanted counts from surrounding tissues.

Line spread function

A representation of the response of a system to a point source, used to assess image resolution in nuclear medicine.

FWHM (Full Width Half Maximum)

A common measurement of resolution indicating the width of a function at half its maximum height, used in imaging.

Hot spot imaging

A technique in nuclear medicine where radiopharmaceuticals localize tightly in an organ, leading to areas of high intensity on the image.

Structured noise

Noise in imaging caused by nonuniformities in the scintillation camera or patient-related factors that affect image quality.

Artifacts

Distortions or inaccuracies in imaging results caused by various factors, including patient movement or equipment malfunction.

Collimator

A device used in gamma cameras to focus and direct incoming gamma radiation towards the detector while minimizing scatter.