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Multi-catheter interstitial brachytherapy
The technique used the longest (most extensive follow up)
14-20 catheters inserted in several planes with 1-1.5 cm intervals
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ensures adequate coverage of the lumpectomy cavity plus margins
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avoids hot and cold spots
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number of catheters depends on size and shape of the target
Technique for insertion:
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Free-hand or template-guided technique
Better QA with CT based 3D planning and image guidance – virtual planning
Delivery of RT:
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LDR, sources of Ir-192 sources are implanted for 2-5 days, inpatient
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HDR, fractionated with each fr varying sec-min, often 34 Gy/10 fr/5 days
(BED equal to 45 Gy in 4.5 days of the LDR regimen used in many APBI
trials), outpatient