ESTRO 2024 - Abstract Book

S5489

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2024

A total of 486 records of the setup time of the patients in the Vac-lok group were collected, with an average of 3:01±3:30min. ， which was 5:04±7:38min in the bellyboard group . There was a significant difference in the setup time between the two groups(P<0.01).

3.SB-V and Mean Dose

The 2000 cGy irradiated small-bowel-volume (V20) was 523.0±224.7cc, the 3000 cGy irradiated small-bowel-volume (V30) was 294.8±124.0cc, the 4000 cGy irradiated small-bowel-volume (V40) ) was 149.8±84.6cc, the irradiated small bowel-volume of 4500 cGy (V45) was 102.0±63.0cc, the irradiated small-bowel-volume of 5000 cGy (V50) was 0.2±0.7cc, and the mean dose to the small intestine (Dmean) was 1249.3±559.4cGy in the Vac-lok group. In the bellyboard group, V20 was 780.9±302.1cc, V30 was 442.8±196.8cc, V40 was 266.5 ±131.6cc, V45 was 198.9 ± 101.8cc, V50 was 2.5 ± 10.5cc, the mean dose was 1792.7±700.8cGy. There were significant differences between the two groups of in the mean dose and the V20 to V45 (P<0.05). There was no significance no statistical significance in V50 (P>0.05). （ Table 2 ）

Conclusion:

The immobilization of Vac-lok in the supine position is better than that of Klarity bellyboard in Lng direction. The immobilization of Klarity bellyboard is better than that of Vac-lok in Lat direction. It takes less setup time for patients using the Vac-Lok. Patients using Vac-Lok have a clear advantage in the mean dose to the small intestine and the irradiated small bowel volume to doses ranging from 2000 cGy to 4500 cGy.

Keywords: Radiotherapy ， BellyBoard ， Vac-lok

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Poster Discussion

Using SGRT for faster, safer and accurate extremity patient positioning