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Nuclear Medicine Communications:
doi: 10.1097/MNM.0b013e3283598395
Original Articles

The accuracy and reproducibility of SPECT target volumes and activities estimated using an iterative adaptive thresholding technique

Grimes, Joshuaa; Celler, Annaa,b; Shcherbinin, Sergeyb; Piwowarska-Bilska, Hannac; Birkenfeld, Bozenac



The Acknowledgements in the article, ‘The accuracy and reproducibility of SPECT target volumes and activities estimated using an iterative adaptive thresholding technique,’ which published in the December 2012 issue of the journal, were stated incorrectly 1.

The correct Acknowledgements should read as follows:

This work is supported in part by a scholarship from the province of British Columbia through the Ministry of Advanced education (Pacific century Graduate Scholarship) and by a grant from the Polish Ministry of Science and Higher Education no. NN4 02 456738/no. agreement 3664/B/PO1/2010/38.

Nuclear Medicine Communications. 35(9):988, September 2014.

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Objective: Our aim was to design a practical and reproducible image segmentation method for calculations of total absorbed doses in organs and tumours for internally delivered radioisotopes. We have built upon our previously proposed use of two separate thresholds and employed an iterative technique for semiautomatic selection of background regions for segmenting an object of interest using thresholds that depend on the source-to-background ratio of activity concentrations.

Methods: The parameters of curves relating volume and activity thresholds to source-to-background ratio were established using phantoms with 20 different inserts. The accuracy of our technique was validated using a second phantom experiment, whereas the reproducibility of volume, activity and dose estimates of organs and tumours was investigated using 13 patient studies. The accuracy and reproducibility of segmentations achieved were assessed using images reconstructed with three different methods that ranged from a standard clinical reconstruction to an advanced quantitative reconstruction approach.

Results: In the validation phantom experiment, bottle volumes and activities measured using iterative adaptive thresholding agreed on average with the true values to within 4%, regardless of the reconstruction method used. In the patient studies, volumes and activities estimated from the single-photon emission computed tomography images reconstructed with clinical software agreed with the volumes and activities estimated using the advanced reconstruction approach to within 6%, whereas the corresponding doses agreed to within 4%.

Conclusion: The proposed iterative adaptive thresholding technique can accurately determine object volume and activity, which allows standard clinical reconstructions to generate absorbed dose estimates that are similar to those values obtained using more advanced reconstruction methods.

© 2012 Lippincott Williams & Wilkins, Inc.


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