Respiratory gating and multifield technique radiotherapy for esophageal cancer.
OBJECTIVE
To investigate the effects of a respiratory gating and multifield technique on the dose-volume histogram (DVH) in radiotherapy for esophageal cancer.


METHODS
Twenty patients who underwent four-dimensional computed tomography for esophageal cancer were included. We retrospectively created the four treatment plans for each patient, with or without the respiratory gating and multifield technique: No gating-2-field, No gating-4-field, Gating-2-field, and Gating-4-field plans. We compared the DVH parameters of the lung and heart in the No gating-2-field plan with the other three plans.


RESULTS
In the comparison of the parameters in the No gating-2-field plan, there are significant differences in the Lung V5Gy, V20Gy, mean dose with all three plans and the Heart V25Gy-V40Gywith Gating-2-field plan, V35Gy, V40Gy, mean dose with No Gating-4-field plan and V30Gy-V40Gy, and mean dose with Gating-4-field plan. The lung parameters were smaller in the Gating-2-field plan and larger in the No gating-4-field and Gating-4-field plans. The heart parameters were all larger in the No gating-2-field plan.


CONCLUSIONS
The lung parameters were reduced by the respiratory gating technique and increased by the multifield technique. The heart parameters were reduced by both techniques. It is important to select the optimal technique according to the risk of complications.
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Atsushi
A
Ohta
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan. kaidu@med.niigata-u.ac.jp.
Motoki
M
Kaidu
Department of Radiation Oncology, Niigata University Medical and Dental Hospital, Asahimachi-dori, Chuo-ku, Niigata, Japan.
Satoshi
S
Tanabe
School of Health Sciences, Niigata University, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Satoru
S
Utsunomiya
School of Health Sciences, Niigata University, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Ryuta
R
Sasamoto
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Katsuya
K
Maruyama
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Kensuke
K
Tanaka
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Hirotake
H
Saito
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Toshimichi
T
Nakano
Department of Radiation Oncology, Niigata University Medical and Dental Hospital, Asahimachi-dori, Chuo-ku, Niigata, Japan.
Miki
M
Shioi
Department of Radiation Oncology, Niigata University Medical and Dental Hospital, Asahimachi-dori, Chuo-ku, Niigata, Japan.
Haruna
H
Takahashi
Department of Radiation Oncology, Niigata University Medical and Dental Hospital, Asahimachi-dori, Chuo-ku, Niigata, Japan.
Naotaka
N
Kushima
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Eisuke
E
Abe
Department of Radiology and Radiation Oncology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi-dori, Chuo-ku, Niigata, 951-8510, Japan.
Hidefumi
H
Aoyama
D000368:Aged; D000369:Aged, 80 and over; D004938:Esophageal Neoplasms / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000532:radiotherapy*; D005260:Female; D056973:Four-Dimensional Computed Tomography / Q000379:methods; D006321:Heart / Q000503:physiopathology / Q000528:radiation effects; D006801:Humans; D008168:Lung / Q000503:physiopathology / Q000528:radiation effects; D008297:Male; D008875:Middle Aged; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods; D061089:Radiotherapy, Image-Guided / Q000379:methods; D055425:Respiratory-Gated Imaging Techniques / Q000379:methods*
Dosimetry; Esophageal cancer; Multifield; Organ at risk; Respiratory gating