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By

Maribel Aguilar

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What is Gallium Scan?

Type of nuclear medicine that uses radioactive tracers.

Radioactive tracers common use in gallium scan.

Gallium 67 radioisotope.

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How does Gallium Scan Work? Intravenous

Laxatives or enemas are going to be taken during this procedure.

Patient is scan with gamma cameras that identifies where the high and low concentrations of gallium are in the body.

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Intravenous Gallium

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Gallium Scan

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Risks of Gallium Scan

Exposure to radiation (gamma rays)

Infection, painful or red in the part where the radioisotope was administer.

Person might develop an allergic reaction to the gallium 67 radioisotope.

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Usage of Gallium Scan Detect a source of infection that is

caused by an unknown fever. Abscess or infections in bones. Monitor the response of antibiotic

treatment. Diagnose inflammatory conditions

(pulmonary fibrosis or sarcoidosis). Detection of lymphomas. Detection of Hodgkins disease.

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Radiation Emitted from the Gallium Scan

Radiation Mean % /Disintegration

Mean Energy (keV)

Gamma-3 35.7% 93.3

Gamma-4 19.7% 184.6

Gamma-6 16.0% 300.2

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Radiation Attenuation by Lead Shielding

Radiation Radiation

cm of Lead (Pb)

Attenuation Factor

cm of Lead (Pb)

Attenuation Factor

0.066 0.5 2.5 10-3

0.41 10-1 4.8 10-4

1.2 10-2

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Replacement of the Gallium Scan

PET scan

SPECT scan

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PET Scan

Some of the common isotopes used are below

Isotope Half-life Maximum Energy (MeV)

Range in Water (mm)

18F 109.7 min. 0.635 2.3911C 20.4 min. 0.96 4.1113N 9.96 min. 1.19 5.3915O 2.07 min. 1.72 8.2

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PET Scan

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PET Scan Images

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SPECT Scan SPECT is more common than PET

scan.

Study Radioisotope

Emission of energy (keV)

Half-life

Bone scan Technetium 99m

140 6 hrs

Myocardial perfusion scan

Technetium 99m

140 6 hrs

Brain scan Technetium 99m

140 6 hrs

Tumor scan

Iodine-123 159 13 hrs

White cell scan

Indium-111 and technetium 99m

171 & 245

67 hrs

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SPECT Scan