Hi art system

Patients diagnosed as being in the high-risk group of intestinal adverse events were given laxatives (0.75% sodium picosulfate hydrate 10 mL) 12 hours before RTP CT scan, and instructed to empty their bladder and rectum 90 minutes before RTP CT scan, and then ERBs (RadiaDyne, LLC, Houston, TX, USA) were inserted and RTP CT scan was performed. Every patient underwent a CT simulation scan with a slice thickness of 2.5 mm. We generated HT RTPs using the dedicated tomotherapy treatment planning station. Dose parameters for the PTV and the OARs were adjusted iteratively until all the values of the parameters shown in Table 2 were met. The prescription dose to 95% of the PTV (D95%) was 76 Gy, which was delivered in 38 fractions using MVCT-based image-guided HT (Hi-ART system, Accuray, Sunnyvale, CA, USA). In each treatment session, ERB was inserted into the rectum and inflated with the same amount of air as when RTP was made.

All patients received Helical Tomotherapy (Hi-ART System, Accuray). The respiratory liver motion was reduced using an abdominal compression technique [16 (link),17 (link)], and the patient underwent a 4D-CT scan with a slice thickness of 3 mm (Siemens Somatom Sensation; Siemens Healthineers Corporation). The gross tumor volume (GTV) included all tumors detected via dynamic CT scan and MRI; an internal target volume (ITV) was generated after including the extension of GTV on the 4D-CT scanning. The planning target volume (PTV) was created as ITV plus a radial margin of 3 mm. Treatment planning was performed on the Monte Carlo algorithm (Monaco®). Patients were treated with a radiation dose of 48–60 Gy in 6–10 fractions, patients underwent on-board megavoltage CT daily for image guidance. The variance in dosage was because of the tumor location near the intestine.

All patients received Helical Tomotherapy (Hi-ART System, Accuray). Abdominal compression technique [17] (link), [18] (link) was used to reduce respiratory liver motion; patient underwent 4D-CT with slice thickness of 3 mm (Siemens Somatom Sensation; Siemens Healthineers Corporation). The gross tumor volume (GTV) included all tumors detected via dynamic CT and MRI; an internal target volume (ITV) was generated after including the extension of GTV on the 4D-CT scanning. The planning target volume (PTV) was created as ITV plus a radial margin of 3 mm. Patients were treated with 48–60 Gy dose in 5–10 fractions, patients underwent on-board MVCT daily for image guidance. The variance in dosage was due to the tumor location being near the intestine.