Analysis of plain X-ray and low resolution CT gonad dose arising from supplementary imaging after bone scanning

Kelly, J, Szczepura, K ORCID:, Hogg, P ORCID: and Tootell, AK ORCID: 2011, Analysis of plain X-ray and low resolution CT gonad dose arising from supplementary imaging after bone scanning , in: European Association of Nuclear Medicine (EANM) 2011, 15th-19th October 2011, Birmingham, UK.

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Introduction:Bone scintigraphy has long been the first stop for patients undergoing investigation of bone metastases. The procedure is recognised as being highly sensitive to the disease however this corresponds to a low specificity. As a result supplementary imaging to characterise and localise lesions is often required to aid definitive diagnosis. There is a range of modalities that can be utilised for this purpose including computed radiography (CR) digital radiography (DR), multidetector computed tomography (MCDT) or CT acquisition using hybrid SPECTCT systems.The choice of modality has implications for patient dose, and therefore careful justification of the chosen procedure is required. The reproductive organs are recognised as radiosensitive, and so dose to these organs needs to be considered.Aim:To compare the absorbed dose by the male and female reproductive organs when imaging the lumbar spine using local protocols in CR, DR, CT component of a SPECT-CT scanner and MDCT.Method:An ATOM 701-D dosimetry phantom and calibrated thermoluminescent dosimeters (TLD) were subjected to radiographic examinations of the lumbar spine using standard department protocols. The TLDs were positioned within the phantom to measure the absorbed dose of the ovaries and testes. Using three repeated measures, antero-posterior and left lateral lumbar spine radiographs were acquired using local diagnostic reference levels on CR and DR technology. CT Imaging of the lumbar spine was carried out using a GE Infinia Hawkeye gamma camera and a GE Lightspeed 64 CT scanner. The TLDs were read using a Hardshaw 3500 manual TLD reader 24 hours after acquisition.Results:The absorbed dose to the ovaries was found to be: DR 6.6mGy; CR 4.4mGy; MDCT 7.1mGy; hybrid CT 3.6mGy (p<0.05)The absorbed dose to the testes was found to be: DR 8.1mGy; CR 4.9mGy; MDCT 4.0mGy; hybrid CT 1.7mGy (p>0.05)Comparison of results using ANNOVA found that the organ dose from the different modalities were significantly different for females, but not for males. Numerical comparison of the results demonstrates that the hybrid CT acquisition resulted in a lower absorbed dose compared to the other modalities for both males and females.Conclusion:This research demonstrates that the dose from the CT component of the hybrid scanner results in the lowest absorbed dose to the reproductive organs. However, surprisingly, the dose to the testes from DR was found to be the highest dose.

Item Type: Conference or Workshop Item (Poster)
Schools: Schools > School of Health and Society
Journal or Publication Title: European Journal of Nuclear Medicine and Molecular Imaging
Publisher: Springer
ISSN: 1619-7070
Related URLs:
Depositing User: K Szczepura
Date Deposited: 26 Feb 2021 12:02
Last Modified: 27 Aug 2021 21:50

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