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British Journal of Radiology (2004) 77, 709
© 2004 British Institute of Radiology
doi: 10.1259/bjr/61086080
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Correspondence

Authors' reply

The Editor—Sir,

We read with interest the letter from Sata et al. We are pleased to note that, by using simultaneous dual isotope windows for Co-57 and 99Tcm, patient effective dose can be further reduced and the scan time can be shortened. In our study [1], the patient effective doses due to transmission and emission scans were individually measured in order to quantify the dose contribution from each scan. A 100 MBq Co-57 flood source was used in the calculation of the effective dose due to the transmission scan to confirm that sentinel lymph node lymphoscintigraphy, even using a Co-57 flood source of moderate radioactively, is a radiologically safe imaging procedure. In our patient management under the 1 day and 2 day protocols, simultaneous transmission and emission scans are taken at the 99Tcm energy window using a Co-57 flood source of radioactivity less than 50 MBq. The scan can be completed within 20 min, which is comparable with the imaging time described in the letter of Sata et al.

Yours etc.,

M Law, K C Cheng, P M Wu, W Y Ho and L W C Chow

Queen Mary Hospital, 102 Pokfulam Road, Hong Kong

Received for publication April 27, 2004. Accepted for publication May 24, 2004.

References

  1. Law M, Cheng KC, Wu PM, Ho WY, Chow LW. Patient effective dose from sentinel lymph node lymphoscintigraphy in breast cancer: a study using a female humanoid phantom and thermoluminescent dosemeters. Br J Radiol 2003;76:818–23.[Abstract/Free Full Text]

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