Dosimetric Comparison of Jaw Tracking Technique with Static Jaw Technique in Intensity-
Modulated Radiotherapy for Cervical Cancer
CUI Enping1, WANG Jing1, PEI Xi2, WANG Zhi1
1. Department of Radiation Oncology, First Affiliated Hospital of Anhui Medical University, Hefei Anhui 230022, China;
2. Center of Radiological Physics, University of Science and Technology of China, Hefei Anhui 230022, China
Abstract：Objective To compare the dosimetric difference between jaw tracking technique (JTT) and static jaw technique (SJT) in
intensity-modulated radiotherapy for cervical cancer. Methods A total of 25 patients with cervical cancer were selected and treated
in three modes: dynamic intensity modulated radiotherapy (dIMRT), static IMRT (sIMRT) and volumetric modulated arc therapy
(VMAT) were used to design a total of 75 groups of treatment plans. When the total prescription dose of the target area was 50 Gy.
The dose distribution of target volume and organs at risk (OAR), number of monitor units and beam time were compared between
the two groups. Results The dose in the target area of the treatment plan of the three treatment techniques could meet the dose
requirements of clinical prescription. There was no statistically significant difference in the planning target volume (PTV) conformity
index and homogeneity index of the JTT plan and the SJT plan among the three treatment modes. The OAR dose of JTT plan in
dIMRT group was significantly lower than that of SJT plan except bladder V50 (P<0.05). The OAR dose of JTT plan in sIMRT group
was significantly lower than that of SJT plan except small intestinal V50 (P<0.05). There was no significant difference in OAR dose
between the two plans in VMAT group (P>0.05). The number of monitor units of JTT plan in dIMRT group and sIMRT group was
significantly higher than that of SJT plan, and the beam delivery time of JTT plan in dIMRT group was significantly higher than that
of SJT plan at the same dose rate (P<0.05), while the beam delivery time of JTT plan in sIMRT group was significantly shorter than
that of SJT plan (P<0.05). There was no significant difference in number of monitor units between JTT plan and SJT plan in VMAT
group (P>0.05), but the beam time of JTT plan was significantly higher than that of SJT plan (P<0.05). Conclusion The use of JTT
and SJT in intensity-modulated radiotherapy for patients with cervical cancer can meet clinical requirements for both target area and
the dose of OAR, but the JTT in dIMRT and sIMRT group can better reduce the OAR dose and reduce the incidence of complications.
JTT technology in VMAT group has no obvious advantage.
崔恩萍1，王景1，裴曦2，汪志1. 铅门跟随技术和铅门固定技术在宫颈癌调强放射治疗中的剂量学比较[J]. 中国医疗设备, 2023, 38(9): 69-74.
CUI Enping1, WANG Jing1, PEI Xi2, WANG Zhi1. Dosimetric Comparison of Jaw Tracking Technique with Static Jaw Technique in Intensity-
Modulated Radiotherapy for Cervical Cancer. China Medical Devices, 2023, 38(9): 69-74.
