Abstract:
PURPOSE:To describe the use of dual source strength implants for focal low-dose-rate brachytherapy. METHODS AND MATERIALS:An interneedle dual source strength planning strategy is described for focal low-dose-rate brachytherapy of the prostate. The implanted treatment plans were designed using peripheral (except near the rectum) needles loaded with high strength (0.9 U) sources and central needles loaded with low strength (0.4 U) sources ("interneedle" dual strength planning). This approach has been applied for focally treating 3 patients. In this article, we compare the characteristics and robustness to source motion of interneedle dual strength planning with four alternative planning strategies (single strength high, low, and intermediate, and intraneedle dual strength) on 50 simulated cases. RESULTS:Interneedle dual source strength planning results in greater robustness to source motion and overall lower seed and needle density compared to the standard low source strength planning currently used in our centre. This planning approach is also significantly superior to single strength high, single strength intermediate and intraneedle dual strength planning strategies in terms of high dose to the urethral avoidance structure. CONCLUSIONS:The use of interneedle dual source strength treatment plans for focal low-dose-rate brachytherapy is possibly the practical solution for limiting the density of sources required to deliver the prescribed dose while limiting proximity of high strength sources to organs at risk.
journal_name
Brachytherapyjournal_title
Brachytherapyauthors
Mahdavi SS,Spadinger IT,Chng NT,Morris WJdoi
10.1016/j.brachy.2016.04.388subject
Has Abstractpub_date
2016-09-01 00:00:00pages
642-9issue
5eissn
1538-4721issn
1873-1449pii
S1538-4721(16)30432-9journal_volume
15pub_type
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