Light speed rt scanner

Manufactured by GE Healthcare

Sourced in United States, United Kingdom

The Light Speed RT scanner from GE Healthcare is a high-performance computed tomography (CT) imaging system. It is designed to acquire rapid, high-quality CT images. The scanner utilizes advanced technology to enable efficient data acquisition and image reconstruction.

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Lab products found in correlation

Eclipse version 11, by Agilent Technologies (2 mentions) Pinnacle3, by Philips (2 mentions) Real time position management rpm system, by Agilent Technologies (1 mentions) Bodyfix, by Elekta (1 mentions) Somatom definition, by Siemens (1 mentions)

6 protocols using light speed rt scanner

Contouring and Radiation Therapy Planning for Brain Tumors

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Contouring and treatment planning were performed using previously acquired computed tomography (CT) images and the Eclipse version 11.0.47 (Varian Medical Systems, Palo Alto, CA, USA). CT images 1.25-mm thick were acquired by a Light Speed RT scanner (GE Healthcare, Milwaukee, WI, USA). Patients were immobilized in thermoplastic masks with bite blocks. Pre- and post-operative magnetic resonance imaging (MRI) scans were fused with the planning CT images.
As cystic lesions change in size during radiation therapy [17 (link)] and as residual tumors were possibly present, each clinical target volume (CTV) was defined to include any residual gross tumor and 5-mm thicknesses of any normal brain tissue attached to each tumor on preoperative MRI imaging. Then, the PTV was defined as the CTV plus 2-mm margin to allow for setup errors and patient motion. The lenses, eyes, optic nerves, chiasm, brainstem, hippocampus, and normal brain tissue were contoured as OAR. The hippocampus was delineated as described by Marsh et al. [18 (link)]. Couch structures were contoured and included in calculations.

Uto M., Mizowaki T., Ogura K, & Hiraoka M. (2016). Non-coplanar volumetric-modulated arc therapy (VMAT) for craniopharyngiomas reduces radiation doses to the bilateral hippocampus: a planning study comparing dynamic conformal arc therapy, coplanar VMAT, and non-coplanar VMAT. Radiation Oncology (London, England), 11, 86.

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Definitive Radiotherapy for Gastric MALT Lymphoma

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All patients received definitive RT. RT was delivered five days per week at daily doses ranging from 1.5 to 2.0 Gy. A total irradiation dose ranging from 30 to 40 Gy (median, 30 Gy) was used. All patients were treated with three-dimensional conformal radiotherapy (3D-CRT). The gross tumor volume (GTV) was defined as the volume corresponding to the lymphoma lesion itself, and the clinical target volume (CTV) was defined as the entire organ with the lymphoma. Adjacent lymph node areas were not routinely included in the CTV. The planning target volume (PTV) was set with an appropriate margin on the CTV, and the irradiation field was set with a leaf margin of 7 mm on the PTV. X-rays at 15 MV were used for treatment. For patients treated after 2017, image-guided RT was performed daily.
During RT, for simulation and treatment, all patients were immobilized in the supine position. For patients with gastric MALT lymphoma, irradiation was performed after fasting for at least 3 hours. Planning CT images were obtained using a LightSpeed RT Scanner (GE Healthcare, Chicago, IL, USA) with a 2.5-mm slice thickness under shallow breathing. During planning for 3D-CRT, contouring of the GTV, CTV, PTV, and organs at risk was performed by radiation oncologists. Dose distributions were calculated using Pinnacle 3 software (Philips, Amsterdam, Netherlands).

Watanabe S., Ogino I, & Hata M. (2020). Radiotherapy for non-gastric intestinal versus gastric MALT lymphoma: a comparison of treatment outcomes. Blood research, 55(4), 200-205.

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Longitudinal CT Imaging for LAPC Patients

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Data from 10 consecutive LAPC patients treated with chemoradiotherapy at our institution between January 2009 and August 2009 were used in this study. All patients had undergone three additional CT scans, performed at an interval of 1–2 weeks during a chemoradiotherapy course and under the same conditions as in the simulation CT scan. The characteristics of the patients are shown in Table 1.
CT was performed under EBH condition using the LightSpeed RT scanner (GE Healthcare, Little Chalfont, UK) and Real‐time Position Management system (RPM; Varian Medical Systems, Palo Alto, CA). The CT slice thickness was 2.5 mm. Patients fasted for at least 3 h and were immobilized in the supine position with both arms raised in a BodyFIX vacuum cushion (Elekta, Stockholm, Sweden).

Ashida R., Nakamura M., Yoshimura M, & Mizowaki T. (2020). Impact of interfractional anatomical variation and setup correction methods on interfractional dose variation in IMPT and VMAT plans for pancreatic cancer patients: A planning study. Journal of Applied Clinical Medical Physics, 21(7), 49-59.

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Stereotactic Radiotherapy for Brain Tumors

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Patients were immobilized in thermoplastic masks, and planning computed tomography (CT) images with a thickness of 1.25 mm were acquired by a Light Speed RT scanner (GE Healthcare, Milwaukee, WI, USA). Contouring and treatment planning were performed using Eclipse version 11.0.47 (Varian Medical Systems, Palo Alto, CA, USA). Contrast-enhanced magnetic resonance imaging (MRI) scans were fused with the planning CT images.
The PTV was defined as the gross tumor volume plus a 1 mm margin to allow for set-up errors, as well as inter- and intrafractional errors. The lenses, eyes, optic nerves, chiasm, brainstem, and normal brain were contoured as organs at risk (OARs). Treatment couch structures were included in the dose calculation.

Uto M., Mizowaki T., Ogura K., Mukumoto N., Katagiri T., Takehana K, & Hiraoka M. (2018). Dosimetric comparison between dual-isocentric dynamic conformal arc therapy and mono-isocentric volumetric-modulated arc therapy for two large brain metastases. Journal of Radiation Research, 59(6), 774-781.

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Radiotherapy Planning for Lung Cancer

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The gross tumor volume (GTV) was defined as the primary lesion in the lung and clinically involved lymph nodes, and the clinical target volume (CTV) was defined as the micro‐infiltrated area around the primary lesion. Adjacent lymph node areas were generally not included in the CTV. The PTV was set with an appropriate margin on the CTV and the irradiation field was set to a leaf margin of 7 mm on the PTV. X‐rays at 6–10 MV were employed for treatment. Image‐guided radiotherapy using cone‐beam CT was conducted daily in all the patients. During radiotherapy, all the patients were immobilized in the supine position using vacuum immobilizers for simulation and treatment. Planning CT images were obtained using a Lightspeed RT Scanner (GE Healthcare UK) with a 2.5‐mm slice thickness under shallow breathing. During the planning of three‐dimensional CRT, contouring of the GTV, CTV, PTV, and organs at risk was performed, and external beam fields were planned with four to eight ports at different gantry angles by radiation oncologists. Dose distributions were calculated using Pinnacle 3 software (Philips).

Hirama N., Yamamoto M., Nagaoka S., Segawa W., Sugimoto C., Nagayama H., Hiro S., Kajita Y., Maeda C., Kubo S., Seki K., Nagahara Y., Teranishi S., Tashiro K., Hara Y., Kobayashi N., Watanabe S., Kudo M, & Kaneko T. (2023). Predictors of lung injury during durvalumab maintenance therapy following concurrent chemoradiotherapy in unresectable locally advanced non‐small cell lung carcinoma. Thoracic Cancer, 14(25), 2601-2607.

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CT Simulation Protocol for Radiotherapy

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Patients were instructed to void the urinary bladder and rectum 1-1.5 hour before CT simulation and were then prohibited from voiding until the end of the simulation [18] . CT simulation was performed in the supine position using a BodyFIX vacuum cushion (Elekta, Stockholm, Sweden).
CT images were acquired using a LightSpeed RT scanner (GE Healthcare, Little Chalfont, UK) with a 2.5-mm slice thickness or a Siemens Somatom Definition (Siemens, Erlangen, Germany) with a 2.0-mm slice thickness.

Ashida R., Nakamura K., Aizawa R., Iramina H., Takayama K., Nakamura M, & Mizowaki T. (2022). Highly hypofractionated intensity-modulated radiation therapy for nonmetastatic prostate cancer with a simultaneous integrated boost to intraprostatic lesions: a planning study. Japanese journal of radiology, 40(2).

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