Application of tangent-arc technology for deep inspiration breath-hold radiotherapy in left-sided breast cancer

Objective To explore the advantages of dosimetry and treatment efficiency tangent-arc technology in deep inspiration breath-hold radiotherapy for breast cancer. Methods Forty patients with left-sided cancer who were treated our hospital from May 2020 to June 2021 randomly selected divided into two groups. The first group’s plan was a continuous semi-arc that started at 145° ( ± 5°) stopped 325° 5°). other plan, defined as had arcs: arc 85° 5°), second 25° We compared target dose, dose organs risk (OARs), time between Results similar semiarc V 5 right lung significantly different groups (Dif 5.52, 95% confidence interval 1.92-9.13, t =3.10, P =0.004), having values (9.16 1.62)%, (3.64 0.73)%, respectively. maximum spinal cord (1835.88 222.17) cGy group (599.42 153.91) group, yielding significant difference 1236.46, 689.32-1783.6, =4.57, <0.001). times (311.70 60.45) s (254.66 40.73) there mean number 57.04, 24.05-90.03, =3.5, =0.001). Conclusion Both plans met clinical prescription requirements. OARs received less radiation than especially (measured ) dose). Tangent-arc took semi-arc, which can greatly improve efficiency. Therefore, are superior all cases.