Accelerated partial breast irradiation in the elderly: 5-year results of high-dose rate multi-catheter brachytherapy

Table 2 Technical and dosimetric data

Data	Mean	Median	Interval
^#needles	9	8	[5 – 16]
^#plans	2	2	[1 – 3]
CTV (cc)	82.3	75.2	[16.9 – 210]
Dose/f (Gy)	3.4	3.4	[3.4 – 4]
^#fractions	10	10	[8 – 10]
Total dose (Gy)	34	34	[32 – 34]
Time interval S/B (d)	17.5	12	[5 – 105]
D90
Gy	3.7	3.7	[2.2 – 8.4]
%	106.2	107.1	[64.1 – 125.9]
EQD2 (Gy)	43.6	43.3	[35 – 72.6]
D100
Gy	2.6	2.7	[1 – 6.6]
%	74.8	77.5	[26 – 100.9]
EQD2 (Gy)	37.4	37.7	[26.9 – 59.8]
V100
cc	76.4	72.2	[16.4 – 192]
%	93.3	95	[68.9 – 100]
V150
cc	36.3	30.6	[7.4 – 96]
%	44.3	43	[22.1 – 81.2]
V200
cc	13.6	11.2	[3.2 – 51.6]
%	17.1	16.6	[9.4 – 47.3]
DHI	52.8	53.6	[18.8 – 73]

^#needles: number of needles; ^#plans: number of plans; CTV: clinical target volume; Dose/f: dose per fraction; ^#fractions: number of fractions; Time interval S/B: time interval between surgery and brachytherapy; D90: dose delivered to 90% of the CTV; D100: dose delivered to 100% of the CTV; V100: part of the CTV receiving 100% of the prescribed dose; V150: part of the CTV receiving 150% of the prescribed dose; V200: part of the CTV receiving 200% of the prescribed dose; DHI: Dose Homogeneity index (1-V150/V100); EQD2: equivalent dose at 2 Gy using an αβ = 4 for breast tissue and breast tumour.

ISSN: 1748-717X