Morales-Nizama RA, Gallozzo-Cárdenas MM, Chinchay-Espino HA, Murga-Torres E, Alvarez-Escobedo AM, Nazario-Naveda R. Program for Determining the Dosimetric Contribution of Tc-99m Biokinetics in Estimating the Dose to the Heart of a Male Adult.
J Med Phys 2024;
49:1-5. [PMID:
38828064 PMCID:
PMC11141756 DOI:
10.4103/jmp.jmp_79_23]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 01/31/2024] [Accepted: 02/16/2024] [Indexed: 06/05/2024] Open
Abstract
Purpose
To calculate the contribution of absorbed dose by organs in the biokinetics of Tc-99m when used for radiodiagnosis of the adult male heart employing a Matlab program.
Methods
The absorbed self-dose of the adult male heart and absorbed dose by organs in the biokinetics of the heart when administering Tc-99m are estimated using the MIRD formalism and the Cristy-Eckerman representation, which have been employed to develop the algorithm in Matlab.
Results
The results indicate that electron capture emissions of 1.446 (mGy/MBq) and Auger electrons of 0.062 (mGy/MBq) are entirely directed towards the target organ (heart) and contribute 29.33% and 1.25% respectively to its total dose. Additionally, the dosimetric contributions of biokinetic organs correspond to characteristic radiation emissions and gamma photons at 2.578 (mGy/MBq) for Tc-99m, representing 52.29% of its total dose.
Conclusion
These dosimetric contributions are significant in estimating the total absorbed dose by the heart in adult males and should not be disregarded.
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