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  4. Vol 3, Issue 5, 2022

Effect of Differences in CT and MR Imaging between Skull and Brain Tissues on Radiotherapy Dosimetry in Patients with Brain Tumors

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DOI: 10.23977/medsc.2022.030506 | Downloads: 22 | Views: 667

Author(s)

Ronghui Jin 1

Affiliation(s)

1 Department of Radiation, Shaanxi Provincial People's Hospital, Xi'an, Shaanxi Province, 710068, China

Corresponding Author

Ronghui Jin

ABSTRACT

Objective: To study and analyze the effect of differences in CT/MR imaging between skull and brain tissues on radiotherapy dosimetry in patients with brain tumors. Methods: 32 patients with brain tumors who received radiotherapy in the hospital from January 2021 to January 2022 were selected for this study. CT and MR scanning were performed on the above patients, and the tumor target areas were delineated on the images according to the image information. And the areas were named as Skull-CT and Skull-MIR, Brain Tissue-CT, Brain Tissue-MR1 (excluding meninges), Brain Tissue-MR (including meninges). According to the image information, the radiotherapy plan was formulated. The first plan was Intensity Modulated Radiotherapy (IMRT). And the second one was based on the CT/MR imaging to obtain the CT2 image by giving the CT value 20 HU according to the differences of skull imaging. And then the first plan was copied to the CT2 image to recalculate the radiotherapy dose. The matching of volume of Skull and Brain Tissues and the influence of different methods on skull MR/CT dosimetry were compared. Results: The volume of the Skull-MR was significantly smaller than that of the Skull-CT (P<0.05), but there was no significant difference between Brain Tissue-MR and Brain Tissue-CT (P>0.05). When local radiotherapy was used, the Skull-Dmax decreased (P<0.05), and the Skull-Dmean increased (P<0.05). And for whole brain radiotherapy, Skull-Dmax decreased (P>0.05), Skull-Dmean increased (P<0.05). Conclusion: There exist certain differences in CT/MR imaging between Skull and Brain Tissues, and the effects of different radiotherapy doses are different.

KEYWORDS

Skull, Brain tissue, Brain tumor, Radiotherapy dose

CITE THIS PAPER

Ronghui Jin, Effect of Differences in CT and MR Imaging between Skull and Brain Tissues on Radiotherapy Dosimetry in Patients with Brain Tumors. MEDS Clinical Medicine (2022) Vol. 3: 33-36. DOI: http://dx.doi.org/10.23977/medsc.2022.030506.

REFERENCES

[1] Liu Jin'e, Shen Yongqi, Liang Xun Si. (2021) Safety Analysis of Simultaneous Integrated Boost Intensity-Modulated Radiotherapy with Different Fractional Doses in Lung Cancer Brain Metastases. Chinese Journal of Medical Physics, 38 (04): 422-425.
[2] Li Yongheng, Gong Guanzhong, Su ya. (2021) Effects of Display Differences on Computed Tomography/Magnetic Resonance Imaging between the Skull and Brain Tissues on Dosimetric Variations in Brain Tumor Radiotherapy. Chinese Journal of Clinical Oncology, 48 (04): 180-185.
[3] Ren Jianxin, Gong Guanzhong, Ma Xingmin. (2020) Study on the Effects of Different CT Values Assignment Methods on Dose Calculation of Brain Metastases Radiotherapy. Chinese Journal of Radiological Medicine and Protection, 01: 26-27-28-29-30-31.
[4] Bao Zhirong, Wang Dajiang, Chen Cheng, Chen Min, Liu Hui, Dai Jing, Xie Conghua. (2019) Dosimetric Study of IMRT Plan after Cervical Cancer Surgery under Different Pelvic Delineation and Dose Limitation Methods. Chinese Journal of Medical Physics, (09).
[5] Hu Zhitao. (2018) Analysis of MRI Manifestations of Malignant Meningioma. International Medicine and Health Guidance News, (07).
[6] Li Yongheng, Gong Guanzhong, Suya. (2021) Study on the Influence of CT and MR Display Difference of Skull and Brain Tissue on Radiotherapy Dosimetry of Brain Tumors. Chinese Journal of Clinical Oncology, 48 (04): 180-185.

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