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Mizonobe K, Akasaka H, Uehara K, Oki Y, Nakayama M, Tamura S, Munetomo Y, Kubo K, Kawaguchi H, Harada A, Mayahara H. Respiratory motion tracking of spine stereotactic radiotherapy in prone position. J Appl Clin Med Phys 2023; 24:e13910. [PMID: 36650923 PMCID: PMC10161010 DOI: 10.1002/acm2.13910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 10/18/2022] [Accepted: 01/04/2023] [Indexed: 01/19/2023] Open
Abstract
PURPOSE The CyberKnife system is a specialized device for non-coplanar irradiation; however, it possesses the geometric restriction that the beam cannot be irradiated from under the treatment couch. Prone positioning is expected to reduce the dose to normal lung tissue in spinal stereotactic body radiotherapy (SBRT) owing to the efficiency of beam arrangement; however, respiratory motion occurs. Therefore, the Xsight spine prone tracking (XSPT) system is used to reduce the effects of respiratory motion. The purpose of this study was to evaluate the motion-tracking error of the spine in the prone position. MATERIALS AND METHODS Data from all 25 patients who underwent spinal SBRT at our institution between April 2020 and February 2022 using CyberKnife (VSI, version 11.1.0) with the XSPT tracking system were retrospectively analyzed using log files. The tumor motion, correlation, and prediction errors for each patient were examined. Furthermore, to assess the potential relationships between the parameters, the relationships between the tumor-motion amplitudes and correlation or prediction errors were investigated using linear regression. RESULTS The tumor-motion amplitudes in each direction were as follows: superior-inferior (SI), 0.51 ± 0.39 mm; left-right (LR), 0.37 ± 0.29 mm; and anterior-posterior (AP), 3.43 ± 1.63 mm. The overall mean correlation and prediction errors were 0.66 ± 0.48 mm and 0.06 ± 0.07 mm, respectively. The prediction errors were strongly correlated with the tumor-motion amplitudes, whereas the correlation errors were not. CONCLUSIONS This study demonstrated that the correlation error of spinal SBRT in the prone position is sufficiently small to be independent of the tumor-motion amplitude. Furthermore, the prediction error is small, contributing only slightly to the tracking error. These findings will improve the understanding of how to compensate for respiratory-motion uncertainty in the prone position.
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Affiliation(s)
- Kazufusa Mizonobe
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Hiroaki Akasaka
- Department of Chemical Engineering, The University of Melbourne, The University of Melbourne Grattan Street, Parkville, Victoria, Australia.,Division of Radiation Oncology, Kobe University Graduate School of Medicine, Chuou-ku, Kobe, Hyogo, Japan
| | - Kazuyuki Uehara
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Yuya Oki
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Masao Nakayama
- Division of Radiation Oncology, Kobe University Graduate School of Medicine, Chuou-ku, Kobe, Hyogo, Japan.,Division of Radiation Therapy, Kita-Harima Medical Center, Ono, Hyogo, Japan
| | - Shuhei Tamura
- Division of Radiological Technology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Yoshiki Munetomo
- Division of Radiological Technology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Katsumaro Kubo
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Hiroki Kawaguchi
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Aya Harada
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
| | - Hiroshi Mayahara
- Division of Radiation Oncology, Kobe Minimally Invasive Cancer Center, Chuo-ku, Kobe, Hyogo, Japan
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Central Nervous System Prophylaxis and Treatment in Acute Leukemias. Curr Treat Options Oncol 2022; 23:1829-1844. [PMID: 36510037 PMCID: PMC9767998 DOI: 10.1007/s11864-022-01032-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/21/2022] [Indexed: 12/15/2022]
Abstract
OPINION STATEMENT Improvements in systemic therapy in the treatment of acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML) have improved patient outcomes and reduced the incidence of CNS relapse. However, management of patients with CNS disease remains challenging, and relapses in the CNS can be difficult to salvage. In addition to treatment with CNS-penetrant systemic therapy (high-dose methotrexate and cytarabine), intrathecal prophylaxis is indicated in all patients with ALL, however is not uniformly administered in patients with AML without high-risk features. There is a limited role for radiation treatment in CNS prophylaxis; however, radiation should be considered for consolidative treatment in patients with CNS disease, or as an option for palliation of symptoms. Re-examining the role of established treatment paradigms and investigating the role of radiation as bridging therapy in the era of cellular therapy, particularly in chemotherapy refractory patients, is warranted.
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A novel rabbit fixator made of a thermoplastic mask for awake imaging experiments. Sci Rep 2021; 11:1546. [PMID: 33452449 PMCID: PMC7810717 DOI: 10.1038/s41598-021-81358-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 01/05/2021] [Indexed: 12/21/2022] Open
Abstract
This study aimed to develop and validate a novel rabbit fixator made from a thermoplastic mask for awake imaging experiments. When heated in a hot-water bath at 65–70 °C for 2–5 min, the thermoplastic mask became soft and could be molded to fit over the entire body of an anesthetized rabbit (4 ml of 3% pentobarbital sodium solution by intramuscular injection). Twenty rabbits were randomly divided into fixator (n = 10) and anesthesia (n = 10) groups. The animals’ vital signs, stress hormones (cortisol and adrenaline), and subjective image quality scores for the computed tomography (CT), positron emission tomography (PET), and magnetic resonance imaging (MRI) scanning were measured and compared. Phantom CT, MRI and PET studies were performed to assess the performance with and without the thermoplastic mask by using image agents at different concentrations or with different radioactivity. The respiration rate (RR), systolic blood pressure (SBP), diastolic blood pressure (DBP), peripheral capillary oxygen saturation (SpO2) and body temperature (T) decreased after anesthesia (all P < 0.05) but did not significantly decrease after fixation (all P > 0.05). The heart rate (HR), cortisol and adrenaline did not significantly decrease after either anesthesia or fixation (all P > 0.05). The subjective image quality scores for the CT and MRI images of the head, thorax, liver, kidney, intestines and pelvis and the subjective image quality scores for the PET images did not significantly differ between the two groups (all P > 0.05). For all examined organs except the muscle, 18F-FDG metabolism was lower after fixation than after anesthesia, and was almost identical of liver between two groups. The phantom study showed that the CT values, standard uptake values and MR T2 signal values did not differ significantly with or without the mask (all P > 0.05). A novel rabbit fixator created using a thermoplastic mask could be used to obtain high-quality images for different imaging modalities in an awake and near-physiological state.
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Lőcsei Z, Farkas R, Borbásné Farkas K, Sebestyén K, Sebestyén Z, Musch Z, Vojcek Á, Benedek N, Mangel L, Ottóffy G. Assessment of the results and hematological side effects of 3D conformal and IMRT/ARC therapies delivered during craniospinal irradiation of childhood tumors with a follow-up period of five years. BMC Cancer 2020; 20:702. [PMID: 32727407 PMCID: PMC7388493 DOI: 10.1186/s12885-020-07168-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 07/12/2020] [Indexed: 01/04/2023] Open
Abstract
Background Craniospinal irradiation (CSI) of childhood tumors with the RapidArc technique is a new method of treatment. Our objective was to compare the acute hematological toxicity pattern during 3D conformal radiotherapy with the application of the novel technique. Methods Data from patients treated between 2007 and 2014 were collected, and seven patients were identified in both treatment groups. After establishing a general linear model, acute blood toxicity results were obtained using SPSS software. Furthermore, the exposure dose of the organs at risk was compared. Patients were followed for a minimum of 5 years, and progression-free survival and overall survival data were assessed. Results After assessment of the laboratory parameters in the two groups, it may be concluded that no significant differences were detected in terms of the mean dose exposures of the normal tissues or the acute hematological side effects during the IMRT/ARC and 3D conformal treatments. Laboratory parameters decreased significantly compared to the baseline values during the treatment weeks. Nevertheless, no significant differences were detected between the two groups. No remarkable differences were confirmed between the two groups regarding the five-year progression-free survival or overall survival, and no signs of serious organ toxicity due to irradiation were observed during the follow-up period in either of the groups. Conclusion The RapidArc technique can be used safely even in the treatment of childhood tumors, as the extent of the exposure dose in normal tissues and the amount of acute hematological side effects are not higher with this technique.
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Affiliation(s)
- Zoltán Lőcsei
- Clinical Center, Department of Oncotherapy, University of Pécs, Édesanyák útja 17, Pécs, 7624, Hungary.
| | - Róbert Farkas
- Oncoradiology Center, Uzsoki Hospital, Uzsoki u. 29-41, Budapest, 1145, Hungary
| | - Kornélia Borbásné Farkas
- Unicersity of Pécs, Medical School, Institute of Bioanalysis, Szigeti út 12, Pécs, 7624, Hungary
| | - Klára Sebestyén
- Clinical Center, Department of Oncotherapy, University of Pécs, Édesanyák útja 17, Pécs, 7624, Hungary
| | - Zsolt Sebestyén
- Clinical Center, Department of Oncotherapy, University of Pécs, Édesanyák útja 17, Pécs, 7624, Hungary
| | - Zoltán Musch
- Clinical Center, Department of Oncotherapy, University of Pécs, Édesanyák útja 17, Pécs, 7624, Hungary
| | - Ágnes Vojcek
- Oncology Unit, Clinical Center, Department of Pediatrics Pécs, University of Pécs, József Attila út 7, Pécs, 7623, Hungary
| | - Noémi Benedek
- Oncology Unit, Clinical Center, Department of Pediatrics Pécs, University of Pécs, József Attila út 7, Pécs, 7623, Hungary
| | - László Mangel
- Clinical Center, Department of Oncotherapy, University of Pécs, Édesanyák útja 17, Pécs, 7624, Hungary
| | - Gábor Ottóffy
- Oncology Unit, Clinical Center, Department of Pediatrics Pécs, University of Pécs, József Attila út 7, Pécs, 7623, Hungary
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Guy CL, Weiss E, Rosu-Bubulac M. Characterization of Respiration-Induced Motion in Prone Versus Supine Patient Positioning for Thoracic Radiation Therapy. Adv Radiat Oncol 2020; 5:466-472. [PMID: 32529142 PMCID: PMC7276676 DOI: 10.1016/j.adro.2020.02.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 11/11/2019] [Accepted: 02/14/2020] [Indexed: 01/14/2023] Open
Abstract
Purpose Variations in the breathing characteristics, both on short term (intrafraction) and long term (interfraction) time scales, may adversely affect the radiation therapy process at all stages when treating lung tumors. Prone position has been shown to improve consistency (ie, reduced intrafraction variability) and reproducibility (ie, reduced interfraction variability) of the respiratory pattern with respect to breathing amplitude and period as a result of natural abdominal compression, with no active involvement required from the patient. The next natural step in investigating breathing-induced changes is to evaluate motion amplitude changes between prone and supine targets or organs at risk, which is the purpose of the present study. Methods and Materials Patients with lung cancer received repeat helical 4-dimensional computed tomography scans, one prone and one supine, during the same radiation therapy simulation session. In the maximum-inhale and maximum-exhale phases, all thoracic structures were delineated by an expert radiation oncologist. Geometric centroid trajectories of delineated structures were compared between patient orientations. Motion amplitude was measured as the magnitude of difference in structure centroid position between inhale and exhale. Results Amplitude of organ motion was larger when the patient was in the prone position compared with supine for all structures except the lower left lobe and left lung as a whole. Across all 12 patients, significant differences in mean motion amplitude between orientations were identified for the right lung (3.0 mm, P = .01), T2 (0.5 mm, P = .01) and T12 (2.1 mm, P < .001) vertebrae, the middle third of the esophagus (4.0 mm, P = .03), and the lung tumor (1.7 mm, P = .02). Conclusions Respiration-induced thoracic organ motion was quantified in the prone position and compared with that of the supine position for 12 patients with thoracic lesions. The prone position induced larger organ motion compared with supine, particularly for the lung tumor, likely requiring increases in planning margins compared with supine.
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Tai P, Koul R, Vu K, Edwards T, Buwembo J, Teles AR, Salim M. A Simplified Supine Technique Expedites the Delivery of Effective Craniospinal Radiation to Medulloblastoma - Comparison with Other Techniques in the Literature. Cureus 2015; 7:e404. [PMID: 26819866 PMCID: PMC4723302 DOI: 10.7759/cureus.404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A 28-year-old man presented to the emergency room with a severe headache of one day's duration. A computerized tomography scan showed a hemorrhagic tumor measuring 3.9 x 4.4 cm in the left cerebellar hemisphere. The resection specimen revealed medulloblastoma. He had two episodes of rebleeding and multiple postoperative issues preventing the use of prone craniospinal radiotherapy. We designed a supine technique for this tall man, which was not complicated to set up. The rapid safe implementation of this technique allowed us to avoid further rebleeding and successfully treat the residual tumor. This technique is the described technique in this case report and is compared to other techniques. At 7.5 years after surgery, he is alive without cancer and with only a mild residual deficit. This case is unusual since the majority of patients with the diagnosis of hemorrhagic medulloblastoma died.
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Affiliation(s)
- Patricia Tai
- Department of Radiation Oncology, Allan Blair Cancer Center, University of Saskatchewan
| | - Rashmi Koul
- Radiation Oncology, CancerCare Manitoba, University of Manitoba
| | - Khanh Vu
- Department of Radiation Oncology, Maisonneuve-Rosemont Hospital
| | - Trent Edwards
- Department of Radiation Oncology, Allan Blair Cancer Center, University of Saskatchewan
| | | | - Alisson R Teles
- Department of Neurosurgery / Laboratory of Clinical Studies and Basic Models of Spinal Disorders, Universidade de Caxias do Sul
| | - Muhammad Salim
- Department of Medical Oncology, Allan Blair Cancer Center, University of Saskatchewan
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Comparison of a new noncoplanar intensity-modulated radiation therapy technique for craniospinal irradiation with 3 coplanar techniques. Med Dosim 2015; 40:296-303. [PMID: 26002123 DOI: 10.1016/j.meddos.2015.03.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 02/15/2015] [Accepted: 03/19/2015] [Indexed: 11/20/2022]
Abstract
When standard conformal x-ray technique for craniospinal irradiation is used, it is a challenge to achieve satisfactory dose coverage of the target including the area of the cribriform plate, while sparing organs at risk. We present a new intensity-modulated radiation therapy (IMRT), noncoplanar technique, for delivering irradiation to the cranial part and compare it with 3 other techniques and previously published results. A total of 13 patients who had previously received craniospinal irradiation with standard conformal x-ray technique were reviewed. New treatment plans were generated for each patient using the noncoplanar IMRT-based technique, a coplanar IMRT-based technique, and a coplanar volumetric-modulated arch therapy (VMAT) technique. Dosimetry data for all patients were compared with the corresponding data from the conventional treatment plans. The new noncoplanar IMRT technique substantially reduced the mean dose to organs at risk compared with the standard radiation technique. The 2 other coplanar techniques also reduced the mean dose to some of the critical organs. However, this reduction was not as substantial as the reduction obtained by the noncoplanar technique. Furthermore, compared with the standard technique, the IMRT techniques reduced the total calculated radiation dose that was delivered to the normal tissue, whereas the VMAT technique increased this dose. Additionally, the coverage of the target was significantly improved by the noncoplanar IMRT technique. Compared with the standard technique, the coplanar IMRT and the VMAT technique did not improve the coverage of the target significantly. All the new planning techniques increased the number of monitor units (MU) used-the noncoplanar IMRT technique by 99%, the coplanar IMRT technique by 122%, and the VMAT technique by 26%-causing concern for leak radiation. The noncoplanar IMRT technique covered the target better and decreased doses to organs at risk compared with the other techniques. All the new techniques increased the number of MU compared with the standard technique.
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Bandurska-Luque A, Piotrowski T, Skrobała A, Ryczkowski A, Adamska K, Kaźmierska J. Prospective study on dosimetric comparison of helical tomotherapy and 3DCRT for craniospinal irradiation - A single institution experience. Rep Pract Oncol Radiother 2015; 20:145-52. [PMID: 25859405 PMCID: PMC4338290 DOI: 10.1016/j.rpor.2014.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 10/28/2014] [Accepted: 12/11/2014] [Indexed: 10/24/2022] Open
Abstract
AIM This prospective study aims to assess feasibility of helical tomotherapy (HT) for craniospinal irradiation (CSI) and perform dosimetric comparison of treatment plans for both HT and 3D conformal radiotherapy (3DCRT). BACKGROUND CSI is a challenging procedure. Large PTV size requires field matching due to technical limitations of standard linear accelerators, which cannot irradiate such volumes as a single field. HT could help to avoid these limitations as irradiation of long fields is possible without field matching. MATERIALS AND METHODS Three adults were enrolled from 2009 to 2010. All patients received radiochemotherapy. Treatment plans in prone position for 3DCRT and in supine position for HT were generated. The superior plan was used for patients' irradiation. Plans were compared with the application of DVH, Dx parameters - where x represents a percentage of the structure volume receiving a normalized dose and homogeneity index (HI). RESULTS All patients received HT irradiation. The treatment was well tolerated. The HT plans resulted in a better dose coverage and uniformity in the PTV: HI were 5.4, 7.8, 6.8 for HT vs. 10.3, 6.6, 10.4 for 3DCRT. For most organs at risk (OARs), the D(V80) was higher for HT than for 3DCRT, whereas D(V5) was lower for HT. CONCLUSIONS HT is feasible for CSI, and in comparison with 3DCRT it improves PTV coverage. HT reduces high dose volumes of OARs, but larger volumes of normal tissue receive low radiation dose. HT requires further study to establish correlations between dosimetrical findings and clinical outcomes, especially with regard to late sequelae of treatment.
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Affiliation(s)
| | - Tomasz Piotrowski
- Department of Electroradiology, University of Medical Sciences, Poznań, Poland
- Medical Physics Department, Greater Poland Cancer Centre, Poznań, Poland
| | - Agnieszka Skrobała
- Department of Electroradiology, University of Medical Sciences, Poznań, Poland
- Medical Physics Department, Greater Poland Cancer Centre, Poznań, Poland
| | - Adam Ryczkowski
- Medical Physics Department, Greater Poland Cancer Centre, Poznań, Poland
| | - Krystyna Adamska
- Radiotherapy Department III, Greater Poland Cancer Centre, Poznań, Poland
| | - Joanna Kaźmierska
- Radiotherapy Department II, Greater Poland Cancer Centre, Poznań, Poland
- Department of Electroradiology, University of Medical Sciences, Poznań, Poland
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Verma J, Mazloom A, Teh BS, South M, Butler EB, Paulino AC. Comparison of supine and prone craniospinal irradiation in children with medulloblastoma. Pract Radiat Oncol 2014; 5:93-8. [PMID: 25413414 DOI: 10.1016/j.prro.2014.05.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 05/06/2014] [Accepted: 05/16/2014] [Indexed: 11/30/2022]
Abstract
PURPOSE To compare port film rejection and treatment outcome according to craniospinal irradiation (CSI) position for medulloblastoma. METHODS AND MATERIALS We retrospectively searched for patients ≤19 years treated with CSI for medulloblastoma at 1 department. We collected the following data: age; sex; risk group; need for general anesthesia; radiation therapy (RT) dose and fractionation; and the acceptance or rejection of weekly port films during treatment. We also collected data on outcomes, including neuraxis recurrence and possible complications such as myelitis. RESULTS Of 46 children identified, 23 were treated prone (median age, 8.1 years) and 23 supine (median age, 7.2 years). High-risk disease was seen in 26% of prone and 35% of supine patients (P = .25). There was no difference in use of general anesthesia between those treated prone versus supine (57% vs 61%). The rejection rate of cranial port films in the prone position was 35%, which was significantly higher than the rate of 8% in patients treated supine (P < .0001). The 5-year progression-free (P = .37) and overall survival (P = .18) rates were 62% and 67% for prone and 76% and 84% for supine patients. There were no isolated junctional failures or radiation myelitis in either CSI position. CONCLUSIONS The supine position for CSI was found to have similar survival outcomes compared with the prone position. A higher proportion of rejected cranial port films was seen in children treated in the prone position.
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Affiliation(s)
- Jonathan Verma
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas
| | - Ali Mazloom
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas
| | - Bin S Teh
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas
| | - Michael South
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas
| | - E Brian Butler
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas
| | - Arnold C Paulino
- Department of Radiation Oncology, The Methodist Hospital, Houston, Texas; Department of Pediatrics, Division of Pediatric Hematology/Oncology, Texas Children's Hospital, Houston, Texas.
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Petersson K, Gebre-Medhin M, Ceberg C, Nilsson P, Engström P, Knöös T, Kjellén E. Haematological toxicity in adult patients receiving craniospinal irradiation--indication of a dose-bath effect. Radiother Oncol 2014; 111:47-51. [PMID: 24680378 DOI: 10.1016/j.radonc.2014.01.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 01/23/2014] [Accepted: 01/26/2014] [Indexed: 01/10/2023]
Abstract
BACKGROUND AND PURPOSE The purpose of this study was to investigate the correlation between the haematological toxicity observed in patients treated with craniospinal irradiation, and the dose distribution in normal tissue, specifically the occurrence of large volumes exposed to low dose. MATERIALS AND METHODS Twenty adult male patients were included in this study; eight treated with helical tomotherapy (HT), and twelve with three-dimensional conformal radiation therapy. The relative volume of red bone marrow and body that was exposed to low dose (i.e. the so-called dose bath) was evaluated and correlated with nadir blood values during treatment, i.e. the severity of anaemia, leukopaenia, and thrombocytopaenia. The correlation was tested for different dose levels representing the dose bath using the Pearson product-moment correlation method. RESULTS We found a significant correlation between the volume of red bone marrow exposed to low dose and the severity of thrombocytopaenia during treatment. Furthermore, for the HT patients, a significant correlation was found between the relative volume of the body exposed to low dose and the severity of anaemia and leukopenia. CONCLUSIONS The severity of haematological toxicity correlated with the fraction of red bone marrow or body that was exposed to low dose.
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Affiliation(s)
- Kristoffer Petersson
- Department of Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden.
| | | | - Crister Ceberg
- Department of Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden
| | - Per Nilsson
- Department of Oncology, Skåne University Hospital, Lund, Sweden
| | - Per Engström
- Department of Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden; Radiation Physics, Skåne University Hospital, Lund, Sweden
| | - Tommy Knöös
- Department of Medical Radiation Physics, Clinical Sciences, Lund University, Lund, Sweden; Radiation Physics, Skåne University Hospital, Lund, Sweden
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