Total Body Irradiation with Step Translation and Dynamic Field Matching

Table 3

The dose variation measured in a RANDO phantom using GAFCHROMIC film strips sandwiched between sections at sites of interest. The film strips were orientated along the AP direction, except for two strips along the lateral orientation at abdomen and head. The dose ratios at midpoints of profiles inside the phantom were normalized to the midpoint dose measured between sections 27 and 28. The dose variation was normalized to the midpoint of separation in body surface for individual profile.

Sites	Head	Neck	lung^1	Overlap; region	Abdomen	Abdomen	Pelvis	Head; (lateral)^2	Abdomen; (lateral)^2
Separation (cm) of body surface	18.5	13	19	15.5	14.5	17.5	19.5	18.5	14.5
Dose ratio of midpoint	0.964	1.021	0.561	1.062	1.076	1.000	0.945	0.955	1.083
Maximum dose in profile (%)	104.6	103.4	101.2	102.8	103.2	103.3	103.3	111.7	109.8
Minimum dose in profile (%)	98.9	99.1	99.3	98.5	96.0	98.4	98.0	99.7	98.4
Between phantom section	2-3	8-9	17-18	23-24	25-26	27-28	31-32	2-3	25-26

1With lung shielding block. ²Film oriented in lateral direction.