Investigation of Effect of Air Gap between Surface and Bolus on Dose Distribution for 6 MV Photon Beam

Osman Vefa Gül

Makale detayları

Investigation of Effect of Air Gap between Surface and Bolus on Dose Distribution for 6 MV Photon Beam

Yazarlar:

Osman Vefa Gül

Yayıncı:

Manisa Celal Bayar University

Ana Başlıklar:

Klasik Fizik (Diğer)

Dergi:

Celal Bayar Üniversitesi Fen Bilimleri Dergisi Vol.19 Issue 4, pp.389-393

Belge Tipi:

Makale

Yayın Tarihi:

12/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001308177

pISSN:

1305-130X

Anahtar kelimeler:

Özet:

 In radiotherapy, tissue equivalent boluses are frequently used in the treatment of superficially located tumors. The air gap between the patients skin and the bolus may cause dosimetric uncertainties. This study aims to dosimetrically investigate the effect of the air gap between the surface and the bolus on dose distribution. Computed tomography CT images of the phantom were obtained and transferred to the treatment planning system TPS. In the TPS, a bolus was placed on the phantom surface and then air gaps were created between the bolus and the surface. The effect of the air gaps between the surface and the 5 mm thick bolus on the dose distribution was analyzed with the point doses obtained from the TPS. For the 6 MV X-ray, it was observed that the air gap negatively affected the surface doses calculated by TPS. Accordingly, an inverse correlation was found between air gap and surface dose. It is recommended that bolus use, especially in curved anatomical regions, should be applied before CT scanning as much as possible. When using bolus material in radiotherapy, it is recommended to be careful not to leave an air gap between the surface and the bolus.

 In radiotherapy, tissue equivalent boluses are frequently used in the treatment of superficially located tumors. The air gap between the patients skin and the bolus may cause dosimetric uncertainties. This study aims to dosimetrically investigate the effect of the air gap between the surface and the bolus on dose distribution. Computed tomography CT images of the phantom were obtained and transferred to the treatment planning system TPS. In the TPS, a bolus was placed on the phantom surface and then air gaps were created between the bolus and the surface. The effect of the air gaps between the surface and the 5 mm thick bolus on the dose distribution was analyzed with the point doses obtained from the TPS. For the 6 MV X-ray, it was observed that the air gap negatively affected the surface doses calculated by TPS. Accordingly, an inverse correlation was found between air gap and surface dose. It is recommended that bolus use, especially in curved anatomical regions, should be applied before CT scanning as much as possible. When using bolus material in radiotherapy, it is recommended to be careful not to leave an air gap between the surface and the bolus.

 In radiotherapy, tissue equivalent boluses are frequently used in the treatment of superficially located tumors. The air gap between the patients skin and the bolus may cause dosimetric uncertainties. This study aims to dosimetrically investigate the effect of the air gap between the surface and the bolus on dose distribution. Computed tomography CT images of the phantom were obtained and transferred to the treatment planning system TPS. In the TPS, a bolus was placed on the phantom surface and then air gaps were created between the bolus and the surface. The effect of the air gaps between the surface and the 5 mm thick bolus on the dose distribution was analyzed with the point doses obtained from the TPS. For the 6 MV X-ray, it was observed that the air gap negatively affected the surface doses calculated by TPS. Accordingly, an inverse correlation was found between air gap and surface dose. It is recommended that bolus use, especially in curved anatomical regions, should be applied before CT scanning as much as possible. When using bolus material in radiotherapy, it is recommended to be careful not to leave an air gap between the surface and the bolus.

 In radiotherapy, tissue equivalent boluses are frequently used in the treatment of superficially located tumors. The air gap between the patients skin and the bolus may cause dosimetric uncertainties. This study aims to dosimetrically investigate the effect of the air gap between the surface and the bolus on dose distribution. Computed tomography CT images of the phantom were obtained and transferred to the treatment planning system TPS. In the TPS, a bolus was placed on the phantom surface and then air gaps were created between the bolus and the surface. The effect of the air gaps between the surface and the 5 mm thick bolus on the dose distribution was analyzed with the point doses obtained from the TPS. For the 6 MV X-ray, it was observed that the air gap negatively affected the surface doses calculated by TPS. Accordingly, an inverse correlation was found between air gap and surface dose. It is recommended that bolus use, especially in curved anatomical regions, should be applied before CT scanning as much as possible. When using bolus material in radiotherapy, it is recommended to be careful not to leave an air gap between the surface and the bolus.

Makale detayları

Investigation of Effect of Air Gap between Surface and Bolus on Dose Distribution for 6 MV Photon Beam

Yazarlar:

Osman Vefa Gül

Yayıncı:

Manisa Celal Bayar University

Ana Başlıklar:

Klasik Fizik (Diğer)

Dergi:

Celal Bayar Üniversitesi Fen Bilimleri Dergisi Vol.19 Issue 4, pp.389-393

Belge Tipi:

Makale

Yayın Tarihi:

12/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001308177

pISSN:

1305-130X

Air-gap effect

bolus

radiotherapy

skin dose

Sayı

Makale detayları

Investigation of Effect of Air Gap between Surface and Bolus on Dose Distribution for 6 MV Photon Beam

Yazarlar: Osman Vefa Gül

Yayıncı: Manisa Celal Bayar University

Ana Başlıklar: Klasik Fizik (Diğer)

Dergi: Celal Bayar Üniversitesi Fen Bilimleri Dergisi Vol.19 Issue 4, pp.389-393

Belge Tipi: Makale

Yayın Tarihi: 12/2023

Belge Dili: İngilizce

Document ID (Org No.): 2001308177

pISSN: 1305-130X

Air-gap effect

bolus

radiotherapy

skin dose

Sayı

Yazarlar:

Osman Vefa Gül

Yayıncı:

Manisa Celal Bayar University

Ana Başlıklar:

Klasik Fizik (Diğer)

Dergi:

Celal Bayar Üniversitesi Fen Bilimleri Dergisi Vol.19 Issue 4, pp.389-393

Belge Tipi:

Makale

Yayın Tarihi:

12/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001308177

pISSN:

1305-130X