Prostate cancer treated with image-guided helical TomoTherapy® and image-guided LINAC-IMRT : Correlation between high-dose bladder volume, margin reduction, and genitourinary toxicity
| Autor: | Thomas G. Wendt, Henning Salz, Michael Schwedas, Sonia Drozdz, Susan Foller |
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| Rok vydání: | 2015 |
| Předmět: |
Male
medicine.medical_treatment Statistics as Topic Urinary Bladder Urogenital System Adenocarcinoma Radiosurgery Tomotherapy 030218 nuclear medicine & medical imaging Radiotherapy High-Energy 03 medical and health sciences Prostate cancer 0302 clinical medicine Prostate medicine Humans Radiology Nuclear Medicine and imaging Radiation Injuries Aged Aged 80 and over Urinary bladder business.industry Prostatic Neoplasms Radiotherapy Dosage Middle Aged medicine.disease Combined Modality Therapy Radiation therapy Gastrointestinal Tract Neck of urinary bladder medicine.anatomical_structure Oncology Surgery Computer-Assisted 030220 oncology & carcinogenesis Radiotherapy Intensity-Modulated Neoplasm Grading Nuclear medicine business Fiducial marker |
| Zdroj: | Strahlentherapie und Onkologie : Organ der Deutschen Rontgengesellschaft ... [et al]. 192(4) |
| ISSN: | 1439-099X |
| Popis: | We compared different image-guidance (IG) strategies for prostate cancer with high-precision IG intensity-modulated radiation therapy (IMRT) using TomoTherapy® (Accuray Inc., Madison, WI, USA) and linear accelerator (LINAC)-IMRT and their impact on planning target volume (PTV) margin reduction. Follow-up data showed reduced bladder toxicity in TomoTherapy patients compared to LINAC-IMRT. The purpose of this study was to quantify whether the treatment delivery technique and decreased margins affect reductions in bladder toxicity. Setup corrections from 30 patients treated with helical TomoTherapy and 30 treated with a LINAC were analyzed. These data were used to simulate three IG protocols based on setup error correction and a limited number of imaging sessions. For all patients, gastrointestinal (GI) and genitourinary (GU) toxicity was documented and correlated with the treatment delivery technique. For fiducial marker (FM)-based RT, a margin reduction of up to 3.1, 3.0, and 4.8 mm in the left–right (LR), superior–inferior (SI), and anterior-posterior (AP) directions, respectively, could be achieved with calculation of a setup correction from the first three fractions and IG every second day. Although the bladder volume was treated with mean doses of 35 Gy in the TomoTherapy group vs. 22 Gy in the LINAC group, we observed less GU toxicity after TomoTherapy. Intraprostate FMs allow for small safety margins, help decrease imaging frequency after setup correction, and minimize the dose to bladder and rectum, resulting in lower GU toxicity. In addition, IMRT delivered with TomoTherapy helps to avoid hotspots in the bladder neck, a critical anatomic structure associated with post-RT urinary toxicity. |
| Databáze: | OpenAIRE |
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