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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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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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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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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