Effect of technetium-99m on iodine-131 thyroid uptake measurements
Journal Article
·
· J. Nucl. Med. Technol.; (United States)
OSTI ID:5877000
Following administration of 2.5-5.0 mCi(/sup 99m/Tc)pertechnetate, several hundred microcuries may be present in the necks of hyperthyroid patients after 6 hr. Coincidence summing of Tc-99m photons may disturb I-131 uptake measurements in such patients if an oral diagnostic dose of I-131 is administered immediately after completion of a (/sup 99m/Tc)pertechnetate scintigram. Using a lower discriminator level of 300 keV, false increases of 10%-50% may occur at 6 hr. The 24-hr uptake is also affected if an I-131 predose measurement is performed after administration of the Tc-99m dose. The authors have shown that these errors may be prevented by using a 1-mm lead filter in front of the scintillation detector. The attenuation of Tc-99m photons by the filter effectively eliminates summation pulses while it reduces the I-131 count rate by approximately 28%.
- Research Organization:
- Tygerberg Hospital, South Africa
- OSTI ID:
- 5877000
- Journal Information:
- J. Nucl. Med. Technol.; (United States), Journal Name: J. Nucl. Med. Technol.; (United States) Vol. 13:2; ISSN JNMTB
- Country of Publication:
- United States
- Language:
- English
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· Clinical Nuclear Medicine; (USA)
·
OSTI ID:6853171
Related Subjects
550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
ATTENUATION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
DIAGNOSTIC USES
DRUGS
ENDOCRINE GLANDS
GLANDS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
NUCLEI
ODD-EVEN NUCLEI
ORAL ADMINISTRATION
ORGANS
OXYGEN COMPOUNDS
PATIENTS
PERTECHNETATES
RADIOISOTOPE SCANNING
RADIOISOTOPES
RADIOPHARMACEUTICALS
REFRACTORY METAL COMPOUNDS
SCINTISCANNING
TECHNETIUM 99
TECHNETIUM COMPOUNDS
TECHNETIUM ISOTOPES
THYROID
TRANSITION ELEMENT COMPOUNDS
USES
YEARS LIVING RADIOISOTOPES
62 RADIOLOGY AND NUCLEAR MEDICINE
ATTENUATION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
DIAGNOSTIC USES
DRUGS
ENDOCRINE GLANDS
GLANDS
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
IODINE 131
IODINE ISOTOPES
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LABELLED COMPOUNDS
NUCLEI
ODD-EVEN NUCLEI
ORAL ADMINISTRATION
ORGANS
OXYGEN COMPOUNDS
PATIENTS
PERTECHNETATES
RADIOISOTOPE SCANNING
RADIOISOTOPES
RADIOPHARMACEUTICALS
REFRACTORY METAL COMPOUNDS
SCINTISCANNING
TECHNETIUM 99
TECHNETIUM COMPOUNDS
TECHNETIUM ISOTOPES
THYROID
TRANSITION ELEMENT COMPOUNDS
USES
YEARS LIVING RADIOISOTOPES