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Rocha PHP, Reali RM, Decnop M, Souza SA, Teixeira LAB, Júnior AL, Sarpi MO, Cintra MB, Pinho MC, Garcia MRT. Adverse Radiation Therapy Effects in the Treatment of Head and Neck Tumors. Radiographics 2022; 42:806-821. [PMID: 35302867 DOI: 10.1148/rg.210150] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Whether used as a single modality or as part of a combined approach, radiation therapy (RT) plays an essential role in the treatment of several head and neck malignancies. Despite the improvement in radiation delivery techniques, normal structures in the vicinity of the target area remain susceptible to a wide range of adverse effects. Given their high incidence, some of these effects are referred to as expected postradiation changes (eg, mucositis, sialadenitis, and edema), while others are considered true complications, meaning they should not be expected and can even represent life-threatening conditions (eg, radionecrosis, fistulas, and radiation-induced neoplasms). Also, according to their timing of onset, these deleterious effects can be divided into four groups: acute (during RT), subacute (within weeks to months), delayed onset (within months to years), and very delayed onset (after several years).The authors provide a comprehensive review of the most important radiation-induced changes related to distinct head and neck sites, focusing on their typical cross-sectional imaging features and correlating them with the time elapsed after treatment. Radiologists should not only be familiar with these imaging findings but also actively seek essential clinical data at the time of interpretation (including knowledge of the RT dose and time, target site, and manifesting symptoms) to better recognize imaging findings, avoid pitfalls and help guide appropriate management. © RSNA, 2022.
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Affiliation(s)
- Pedro H P Rocha
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Raphael M Reali
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Marcos Decnop
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Soraia A Souza
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Lorine A B Teixeira
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Ademar Lucas Júnior
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Maíra O Sarpi
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Murilo B Cintra
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Marco C Pinho
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
| | - Marcio R T Garcia
- From the Division of Head and Neck Radiology, Diagnósticos da América SA/DASA, São Paulo, Brazil (P.H.P.R., R.M.R., S.A.S., M.O.S., M.B.C., M.R.T.G.); Division of Head and Neck Radiology, Instituto Nacional do Câncer (INCA), Rio de Janeiro, Brazil (M.D.); Departments of Diagnostic Imaging (S.A.S., M.B.C.) and Radiation Therapy (L.A.B.T.), Instituto do Câncer do Estado de São Paulo (ICESP) do HCFMUSP, São Paulo, Brazil; Department of Radiation Therapy, Hospital Santa Paula, São Paulo, Brazil (L.A.B.T.); Division of Head and Neck and Neuroradiology, Grupo São Camilo/ DASA, Maringá, Brazil (A.L.J.); Division of Head and Neck Radiology, Instituto de Radiologia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (InRad/ HC-FMUSP), São Paulo, Brazil (M.O.S.); and Department of Radiology, UT Southwestern Medical Center, Dallas, Tex (M.C.P.)
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Xue C, Yuan J, Zhou Y, Wong OL, Cheung KY, Yu SK. Acquisition repeatability of MRI radiomics features in the head and neck: a dual-3D-sequence multi-scan study. Vis Comput Ind Biomed Art 2022; 5:10. [PMID: 35359245 PMCID: PMC8971276 DOI: 10.1186/s42492-022-00106-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 02/23/2022] [Indexed: 02/08/2023] Open
Abstract
Radiomics has increasingly been investigated as a potential biomarker in quantitative imaging to facilitate personalized diagnosis and treatment of head and neck cancer (HNC), a group of malignancies associated with high heterogeneity. However, the feature reliability of radiomics is a major obstacle to its broad validity and generality in application to the highly heterogeneous head and neck (HN) tissues. In particular, feature repeatability of radiomics in magnetic resonance imaging (MRI) acquisition, which is considered a crucial confounding factor of radiomics feature reliability, is still sparsely investigated. This study prospectively investigated the acquisition repeatability of 93 MRI radiomics features in ten HN tissues of 15 healthy volunteers, aiming for potential magnetic resonance-guided radiotherapy (MRgRT) treatment of HNC. Each subject underwent four MRI acquisitions with MRgRT treatment position and immobilization using two pulse sequences of 3D T1-weighed turbo spin-echo and 3D T2-weighed turbo spin-echo on a 1.5 T MRI simulator. The repeatability of radiomics feature acquisition was evaluated in terms of the intraclass correlation coefficient (ICC), whereas within-subject acquisition variability was evaluated in terms of the coefficient of variation (CV). The results showed that MRI radiomics features exhibited heterogeneous acquisition variability and uncertainty dependent on feature types, tissues, and pulse sequences. Only a small fraction of features showed excellent acquisition repeatability (ICC > 0.9) and low within-subject variability. Multiple MRI scans improved the accuracy and confidence of the identification of reliable features concerning MRI acquisition compared to simple test-retest repeated scans. This study contributes to the literature on the reliability of radiomics features with respect to MRI acquisition and the selection of reliable radiomics features for use in modeling in future HNC MRgRT applications.
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Affiliation(s)
- Cindy Xue
- Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Jing Yuan
- Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China.
| | - Yihang Zhou
- Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Oi Lei Wong
- Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Kin Yin Cheung
- Medical Physics Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Siu Ki Yu
- Medical Physics Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
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3
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Li M, Wan C. The use of deep learning technology for the detection of optic neuropathy. Quant Imaging Med Surg 2022; 12:2129-2143. [PMID: 35284277 PMCID: PMC8899937 DOI: 10.21037/qims-21-728] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/26/2021] [Indexed: 03/14/2024]
Abstract
The emergence of computer graphics processing units (GPUs), improvements in mathematical models, and the availability of big data, has allowed artificial intelligence (AI) to use machine learning and deep learning (DL) technology to achieve robust performance in various fields of medicine. The DL system provides improved capabilities, especially in image recognition and image processing. Recent progress in the sorting of AI data sets has stimulated great interest in the development of DL algorithms. Compared with subjective evaluation and other traditional methods, DL algorithms can identify diseases faster and more accurately in diagnostic tests. Medical imaging is of great significance in the clinical diagnosis and individualized treatment of ophthalmic diseases. Based on the morphological data sets of millions of data points, various image-related diagnostic techniques can now impart high-resolution information on anatomical and functional changes, thereby providing unprecedented insights in ophthalmic clinical practice. As ophthalmology relies heavily on imaging examinations, it is one of the first medical fields to apply DL algorithms in clinical practice. Such algorithms can assist in the analysis of large amounts of data acquired from the examination of auxiliary images. In recent years, rapid advancements in imaging technology have facilitated the application of DL in the automatic identification and classification of pathologies that are characteristic of ophthalmic diseases, thereby providing high quality diagnostic information. This paper reviews the origins, development, and application of DL technology. The technical and clinical problems associated with building DL systems to meet clinical needs and the potential challenges of clinical application are discussed, especially in relation to the field of optic nerve diseases.
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Affiliation(s)
- Mei Li
- Department of Ophthalmology, Yanan People’s Hospital, Yanan, China
| | - Chao Wan
- Department of Ophthalmology, the First Hospital of China Medical University, Shenyang, China
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Olin AB, Thomas C, Hansen AE, Rasmussen JH, Krokos G, Urbano TG, Michaelidou A, Jakoby B, Ladefoged CN, Berthelsen AK, Håkansson K, Vogelius IR, Specht L, Barrington SF, Andersen FL, Fischer BM. Robustness and Generalizability of Deep Learning Synthetic Computed Tomography for Positron Emission Tomography/Magnetic Resonance Imaging-Based Radiation Therapy Planning of Patients With Head and Neck Cancer. Adv Radiat Oncol 2021; 6:100762. [PMID: 34585026 PMCID: PMC8452789 DOI: 10.1016/j.adro.2021.100762] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 07/13/2021] [Accepted: 07/19/2021] [Indexed: 11/26/2022] Open
Abstract
Purpose Radiotherapy planning based only on positron emission tomography/magnetic resonance imaging (PET/MRI) lacks computed tomography (CT) information required for dose calculations. In this study, a previously developed deep learning model for creating synthetic CT (sCT) from MRI in patients with head and neck cancer was evaluated in 2 scenarios: (1) using an independent external dataset, and (2) using a local dataset after an update of the model related to scanner software-induced changes to the input MRI. Methods and Materials Six patients from an external site and 17 patients from a local cohort were analyzed separately. Each patient underwent a CT and a PET/MRI with a Dixon MRI sequence over either one (external) or 2 (local) bed positions. For the external cohort, a previously developed deep learning model for deriving sCT from Dixon MRI was directly applied. For the local cohort, we adapted the model for an upgraded MRI acquisition using transfer learning and evaluated it in a leave-one-out process. The sCT mean absolute error for each patient was assessed. Radiotherapy dose plans based on sCT and CT were compared by assessing relevant absorbed dose differences in target volumes and organs at risk. Results The MAEs were 78 ± 13 HU and 76 ± 12 HU for the external and local cohort, respectively. For the external cohort, absorbed dose differences in target volumes were within ± 2.3% and within ± 1% in 95% of the cases. Differences in organs at risk were <2%. Similar results were obtained for the local cohort. Conclusions We have demonstrated a robust performance of a deep learning model for deriving sCT from MRI when applied to an independent external dataset. We updated the model to accommodate a larger axial field of view and software-induced changes to the input MRI. In both scenarios dose calculations based on sCT were similar to those of CT suggesting a robust and reliable method.
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Affiliation(s)
- Anders B Olin
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Christopher Thomas
- Department of Medical Physics, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Adam E Hansen
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.,Faculty of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark.,Department of Radiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Jacob H Rasmussen
- Department of Otorhinolaryngology, Head & Neck Surgery and Audiology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.,Department of Otorhinolaryngology and Maxillofacial Surgery, Zealand University Hospital, Køge, Denmark
| | - Georgios Krokos
- King's College London and Guy's and St Thomas' PET Centre, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, London, United Kingdom
| | - Teresa Guerrero Urbano
- Department of Oncology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Andriana Michaelidou
- Department of Oncology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
| | - Björn Jakoby
- Siemens Healthcare GmbH, Erlangen, Germany.,University of Surrey, Guildford, Surrey, United Kingdom
| | - Claes N Ladefoged
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Anne K Berthelsen
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Katrin Håkansson
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Ivan R Vogelius
- Department of Oncology, Section of Radiotherapy, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Lena Specht
- Faculty of Health and Medical Science, University of Copenhagen, Copenhagen, Denmark.,Department of Oncology, Section of Radiotherapy, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Sally F Barrington
- King's College London and Guy's and St Thomas' PET Centre, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, London, United Kingdom
| | - Flemming L Andersen
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
| | - Barbara M Fischer
- Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.,King's College London and Guy's and St Thomas' PET Centre, School of Biomedical Engineering and Imaging Sciences, King's College London, King's Health Partners, London, United Kingdom
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Emam H, Aref M, Abdelbaset-Ismail A, Abdelaal A, Gouda S, Gomaa M. Description of normal head structures of the one-humped camel ( Camelus dromedarius) by magnetic resonance imaging, computed tomography, and cross-sectional anatomy. Vet World 2020; 13:1581-1587. [PMID: 33061230 PMCID: PMC7522936 DOI: 10.14202/vetworld.2020.1581-1587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/19/2020] [Indexed: 11/22/2022] Open
Abstract
Aim: This study was designed for the 1st time to describe the normal head structures of one-humped camel (Camelus dromedarius) using both magnetic resonance imaging (MRI) and computed tomography (CT) as well as cross-sectional anatomy. Materials and Methods: Five fresh cadaver heads were collected from clinically normal camels and then subjected to T1-weighted MR and CT imaging. Afterward, these examined heads were transversely sliced to obtain seven crossing levels. Results: The obtained structures per each crossing level were matched with their relevant sorted images of T1-weighted MRI and CT, then identified and labeled accordingly. Conclusion: The data shown herein expand our knowledge of the normal head structures of the camel and could be used as a reference for ultimate diagnosis of the surgical affections of head using MRI and/or CT.
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Affiliation(s)
- Hassan Emam
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
| | - Mohamed Aref
- Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
| | - Ahmed Abdelbaset-Ismail
- Department of Surgery, Radiology and Anaesthesiology, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
| | - Ahmed Abdelaal
- Department of Animal Medicine, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
| | - Shaimaa Gouda
- Department of Animal Medicine, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
| | - Mohamed Gomaa
- Department of Surgery, Radiology and Anaesthesiology, Faculty of Veterinary Medicine, Zagazig University, 44159 Zagazig, El-Sharkia, Egypt
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PET and MRI based RT treatment planning: Handling uncertainties. Cancer Radiother 2019; 23:753-760. [PMID: 31427076 DOI: 10.1016/j.canrad.2019.08.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 08/03/2019] [Indexed: 12/11/2022]
Abstract
Imaging provides the basis for radiotherapy. Multi-modality images are used for target delineation (primary tumor and nodes, boost volume) and organs at risk, treatment guidance, outcome prediction, and treatment assessment. Next to anatomical information, more and more functional imaging is being used. The current paper provides a brief overview of the different applications of imaging techniques used in the radiotherapy process, focusing on uncertainties and QA. The paper mainly focuses on PET and MRI, but also provides a short discussion on DCE-CT. A close collaboration between radiology, nuclear medicine and radiotherapy departments provides the key to improve the quality of radiotherapy. Jointly developed imaging protocols (RT position setup, immobilization tools, lasers, flat table…), and QA programs are mandatory. For PET, suitable windowing in consultation with a Nuclear Medicine Physician is crucial (differentiation benign/malignant lesions, artifacts…). A basic knowledge of MRI sequences is required, in such a way that geometrical distortions are easily recognized by all members the RT and RT physics team. If this is not the case, then the radiologist should be introduced systematically in the delineation process and multidisciplinary meetings need to be organized regularly. For each image modality and each image registration process, the associated uncertainties need to be determined and integrated in the PTV margin. When using functional information for dose painting, response assessment or outcome prediction, collaboration between the different departments is even more important. Limitations of imaging based biomarkers (specificity, sensitivity) should be known.
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Zhou Y, Wong OL, Cheung KY, Yu SK, Yuan J. A pilot study of highly accelerated 3D MRI in the head and neck position verification for MR-guided radiotherapy. Quant Imaging Med Surg 2019; 9:1255-1269. [PMID: 31448211 DOI: 10.21037/qims.2019.06.18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Background To evaluate the performance of a highly accelerated 3D MRI on inter-fractional positional measurement for MR-guided radiotherapy (MRgRT) in the head and neck (HN). Methods Fourteen healthy volunteers received 159 scans on a 1.5 T MR-sim to simulate MRgRT fractions. MRI acquisition included a high-resolution (HQI-MRI, voxel-size =1.05×1.05×1.05 mm3, duration =5 min) and a highly-accelerated low-resolution (true-LQI-MRI, acceleration-factor =9, voxel-size =1.4×1.4×1.4 mm3, duration =86 s) T1w spin-echo sequence (TR/TE =420/7.2 ms). The first session HQI-MRI was used as the reference to mimic planning MRI. Other HQI-MRI was also retrospectively down-sampled in K-space and GRAPPA reconstructed to generate pseudo-LQI-MRI. Inter-sessional positional shift calculated from HQI-MRI, true-LQI-MRI and pseudo-LQI-MRI rigidly registering to the reference were analyzed and compared in the overall HN and the sub-regions of brain, nasopharynx, oropharynx and hypopharynx. Results The calculated SD of systematic errors (Σ) from HQI-MRI/pseudo-LQI-MRI/true-LQI-MRI images for overall HN were 1.11/1.14/1.08, 0.28/0.26/0.29, 0.43/0.44/0.60, and 0.77/0.79/0.74 mm for translation in LR, AP, SI and 3D, respectively; The corresponding RMS of random errors (σ) were 0.97/0.98/0.96, 0.28/0.27/0.26, 0.77/0.77/0.72, and 0.85/0.87/0.85 mm. For all sub-regions, brain showed the smallest Σ and σ in 3D. Other sub-regions showed direction-dependent error patterns, but the positioning results were consistent, independent of the datasets used for registration. Conclusions A highly-accelerated 3D-MRI could be used for MR-guided HN radiotherapy without compromising position verification accuracy.
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Affiliation(s)
- Yihang Zhou
- Medical Physics and Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Oi Lei Wong
- Medical Physics and Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Kin Yin Cheung
- Medical Physics and Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Siu Ki Yu
- Medical Physics and Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
| | - Jing Yuan
- Medical Physics and Research Department, Hong Kong Sanatorium & Hospital, Hong Kong, China
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Garbajs M, Strojan P, Surlan-Popovic K. Prognostic role of diffusion weighted and dynamic contrast-enhanced MRI in loco-regionally advanced head and neck cancer treated with concomitant chemoradiotherapy. Radiol Oncol 2019; 53:39-48. [PMID: 30840595 PMCID: PMC6411028 DOI: 10.2478/raon-2019-0010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 02/04/2019] [Indexed: 02/08/2023] Open
Abstract
Background In the study, the value of pre-treatment dynamic contrast-enhanced (DCE) and diffusion weighted (DW) MRI-derived parameters as well as their changes early during treatment was evaluated for predicting disease-free survival (DFS) and overall survival (OS) in patients with locoregionally advanced head and neck squamous carcinoma (HNSCC) treated with concomitant chemoradiotherapy (cCRT) with cisplatin. Patients and methods MRI scans were performed in 20 patients with locoregionally advanced HNSCC at baseline and after 10 Grays (Gy) of cCRT. Tumour apparent diffusion coefficient (ADC) and DCE parameters (volume transfer constant [Ktrans], extracellular extravascular volume fraction [ve], and plasma volume fraction [Vp]) were measured. Relative changes in parameters from baseline to 10 Gy were calculated. Univariate and multivariate Cox regression analysis were conducted. Receiver operating characteristic (ROC) curve analysis was employed to identify parameters with the best diagnostic performance. Results None of the parameters was identified to predict for DFS. On univariate analysis of OS, lower pre-treatment ADC (p = 0.012), higher pre-treatment Ktrans (p = 0.026), and higher reduction in Ktrans (p = 0.014) from baseline to 10 Gy were identified as significant predictors. Multivariate analysis identified only higher pre-treatment Ktrans (p = 0.026; 95% CI: 0.000-0.132) as an independent predictor of OS. At ROC curve analysis, pre-treatment Ktrans yielded an excellent diagnostic accuracy (area under curve [AUC] = 0.95, sensitivity 93.3%; specificity 80 %). Conclusions In our group of HNSCC patients treated with cisplatin-based cCRT, pre-treatment Ktrans was found to be a good predictor of OS.
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Affiliation(s)
- Manca Garbajs
- Institute of Clinical Radiology, University Medical CentreLjubljana, Slovenia
- Manca Garbajs, M.D., Institute of Clinical Radiology, University Medical Centre, Zaloška c. 7, SI-1000 Ljubljana, Slovenia.
Phone: + 386 40 212 226
| | - Primoz Strojan
- Division of Radiation Oncology, Institute of Oncology, Ljubljana, Slovenia
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9
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Shi L, Du FL, Sun ZW, Zhang L, Chen YY, Xie TM, Li PJ, Huang S, Dong BQ, Zhang MM. Radiation-induced gray matter atrophy in patients with nasopharyngeal carcinoma after intensity modulated radiotherapy: a MRI magnetic resonance imaging voxel-based morphometry study. Quant Imaging Med Surg 2018; 8:902-909. [PMID: 30505719 DOI: 10.21037/qims.2018.10.09] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Background Gray matter (GM) damage after radiotherapy (RT) in nasopharyngeal carcinoma (NPC) patients can result in cognitive impairment, while there may be no visible brain tissue change according to the conventional magnetic resonance imaging (MRI). This study investigated radiation-induced GM volume differences between NPC patients who received RT and those who did not. Methods High-resolution brain structural MRI data from two groups of patients were acquired. The pre-RT group was composed of 56 newly diagnosed but not yet medically treated NPC patients, while the after-RT group consisted of 40 NPC patients who had completed RT more than 1 year ago. Voxel-based morphometry (VBM) was applied to assess GM volumes. Two sample t-test was used to analyze GM volumes voxel-by-voxel using the VBM8 toolbox built in the SPM software. Radiation-induced cortical volume alteration in all NPC patients after RT and dosimetry of 36 patients were analyzed. Results Compared to pre-treatment group, cortical volumes of GM were significantly smaller in the left hippocampus, the right pulvinar and the right middle temporal gyrus (MTG, P<0.001, AlphaSim correction, cluster size ≥157). The mean dose (Dmean) for bilateral hippocampal heads were significantly higher than other different parts of the brain (P<0.001). No significant correlations between the GM volume in any brain regions and the mean dose of corresponding position of these brain regions were observed (P>0.05). Conclusions Radiation to the NPC patients can not only induce damage of the hippocampus, but also other secondary damages of GM.
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Affiliation(s)
- Lei Shi
- Department of Radiology, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China.,Department of Radiology, Zhejiang Cancer Hospital, Hangzhou 310022, China.,Zhejiang Key Laboratory of Radiation Oncology, Hangzhou 310022, China
| | - Feng-Lei Du
- Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou 310022, China
| | - Zong-Wen Sun
- Department of Oncology, Jining No.1 People's Hospital, Jining 272000, China
| | - Lan Zhang
- Department of Ophthalmology, Zhejiang Provincial People's Hospital, Hangzhou 310014, China
| | - Yuan-Yuan Chen
- Zhejiang Key Laboratory of Radiation Oncology, Hangzhou 310022, China.,Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou 310022, China
| | - Tie-Ming Xie
- Department of Radiology, Zhejiang Cancer Hospital, Hangzhou 310022, China.,Zhejiang Key Laboratory of Radiation Oncology, Hangzhou 310022, China
| | - Pei-Jing Li
- Department of Radiology, Zhejiang Cancer Hospital, Hangzhou 310022, China
| | - Shuang Huang
- Zhejiang Key Laboratory of Radiation Oncology, Hangzhou 310022, China.,Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou 310022, China
| | - Bai-Qiang Dong
- Zhejiang Key Laboratory of Radiation Oncology, Hangzhou 310022, China.,Department of Radiation Oncology, Zhejiang Cancer Hospital, Hangzhou 310022, China
| | - Min-Ming Zhang
- Department of Radiology, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China
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10
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Li Y, Tan J, Wee J, Chua M. Adaptive radiotherapy for head and neck cancers: Fact or fallacy to improve therapeutic ratio? Cancer Radiother 2018; 22:287-295. [DOI: 10.1016/j.canrad.2018.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Accepted: 01/18/2018] [Indexed: 12/18/2022]
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11
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Zhao Y, Li X, Li L, Wang X, Lin M, Zhao X, Luo D, Li J. Preliminary study on the diagnostic value of single-source dual-energy CT in diagnosing cervical lymph node metastasis of thyroid carcinoma. J Thorac Dis 2017; 9:4758-4766. [PMID: 29268547 DOI: 10.21037/jtd.2017.09.151] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background To investigate the value of single-source dual-energy spectral CT imaging in improving the accuracy of preoperative diagnosis of lymph node metastasis of thyroid carcinoma. Methods Thirty-four thyroid carcinoma patients were enrolled and received spectral CT scanning before thyroidectomy and cervical lymph node dissection surgery. Iodine-based material decomposition (MD) images and 101 sets of monochromatic images from 40 to 140 keV were reconstructed after CT scans. The iodine concentrations (IC) of lymph nodes were measured on the MD images and was normalized to that of common carotid artery to obtain the normalized iodine concentration (NIC). The CT number of lymph nodes as function of photon energy was measured on the 101 sets of images to generate a spectral HU curve and to calculate its slope λHU. The measurements between the metastatic and non-metastatic lymph nodes were statistically compared and receiver operating characteristic (ROC) curves were used to determine the optimal thresholds of these measurements for diagnosing lymph nodes metastasis. Results There were 136 lymph nodes that were pathologically confirmed. Among them, 102 (75%) were metastatic and 34 (25%) were non-metastatic. The IC, NIC and the slope λHU of the metastatic lymph nodes were 3.93±1.58 mg/mL, 0.70±0.55 and 4.63±1.91, respectively. These values were statistically higher than the respective values of 1.77±0.71 mg/mL, 0.29±0.16 and 2.19±0.91 for the non-metastatic lymph nodes (all P<0.001). ROC analysis determined the optimal diagnostic threshold for IC as 2.56 mg/mL, with the sensitivity, specificity and accuracy of 83.3%, 91.2% and 85.3%, respectively. The optimal threshold for NIC was 0.289, with the sensitivity, specificity and accuracy of 96.1%, 76.5% and 91.2%, respectively. The optimal threshold for the spectral curve slope λHU was 2.692, with the sensitivity, specificity and accuracy of 88.2%, 82.4% and 86.8%, respectively. Conclusions The measurements obtained in dual-energy spectral CT improve the sensitivity and accuracy for preoperatively diagnosing lymph node metastasis in thyroid carcinoma.
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Affiliation(s)
- Yanfeng Zhao
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Xiaolu Li
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Lin Li
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Xiaoyi Wang
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Meng Lin
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Xinming Zhao
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Dehong Luo
- Department of Diagnostic Radiology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Jianying Li
- CT Research Center, GE Healthcare China, Beijing 100176, China
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12
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Gu LS, Cui NY, Wang Y, Che SN, Zou SM, He W, Liu JY, Gong XT. Comparison of sonographic characteristics of primary thyroid lymphoma and anaplastic thyroid carcinoma. J Thorac Dis 2017; 9:4774-4784. [PMID: 29268549 PMCID: PMC5720985 DOI: 10.21037/jtd.2017.09.48] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Accepted: 09/07/2017] [Indexed: 12/16/2022]
Abstract
BACKGROUND Although primary thyroid lymphoma (PTL) and anaplastic thyroid carcinoma (ATC) both account for a rare portion of the morbidity of all thyroid malignancies, the therapeutic methods and prognosis for these two diseases are different. The purpose of this study was to investigate the sonographic characteristics of PTL and ATC and to compare the sonographic findings of PTL and ATC. METHODS The study included 42 patients with histopathologically proven PTL (n=27) and ATC (n=15). The Clinical characteristics and sonographic findings were retrospectively reviewed and compared between the two groups. RESULTS The mean age of patients with ATC was not significantly different from that in patients with PTL (P=0.601). The female-to-male ratio of patients with ATC was significantly lower than that of patients with PTL (P=0.029). Both PTL and ATC commonly present as a relatively large, solid mass on sonography with compressive symptoms, in which hoarseness was seen more frequently in ATC group (66.7%) than in PTL group (14.8%) (P=0.001). There is no significant difference in thyroid size, nodular size, margin, shape, echo texture, echogenicity, cystic change, vascularity and local invasion on sonography between ATC and PTL groups. Echogenic strands, markedly hypoechoic and enhanced posterior echo were seen more frequently in PTL group (92.6%, 92.6%, and 85.2%, respectively) than those in ATC group (6.7%, 60.0%, and 33.3%, respectively) (P<0.05), and calcification was seen more frequently in ATC group (80.0%) than in PTL group (0%) (P<0.001). Three ultrasound patterns were observed for PTL including diffuse type (25.9%), nodular type (48.2%) and mixed type (25.9%), while all ATC cases presented with nodular type (100.0%). Associated Hashimoto's thyroiditis occurred more frequently in PTL group (59.3%) than in ATC group (20.0%) (P=0.023). CONCLUSIONS Certain sonographic features as a markedly hypoechogenicity, the presence of an enhanced posterior echo and linear echogenic strands, lack of calcification and associated Hashimoto's thyroiditis were valuable for distinguishing PTL from ATC. In contrast, heterogeneous echogenicity, uncircumscribed margin, irregular shape, and vascular pattern were not specific features for differential diagnosis.
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Affiliation(s)
- Li-Shuang Gu
- Department of Ultrasound, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Ning-Yi Cui
- Department of Ultrasound, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Yong Wang
- Department of Ultrasound, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Shu-Nan Che
- Department of Diagnostic Imaging, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Shuang-Mei Zou
- Department of Pathology, National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - Wen He
- Department of Ultrasound, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China
| | - Jun-Ying Liu
- Department of Ultrasound, Fudan University Shanghai Cancer Center, Shanghai 200032, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Xuan-Tong Gong
- Department of Ultrasound, Fatou Community Health Center, Beijing 100023, China
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Colliez F, Gallez B, Jordan BF. Assessing Tumor Oxygenation for Predicting Outcome in Radiation Oncology: A Review of Studies Correlating Tumor Hypoxic Status and Outcome in the Preclinical and Clinical Settings. Front Oncol 2017; 7:10. [PMID: 28180110 PMCID: PMC5263142 DOI: 10.3389/fonc.2017.00010] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 01/10/2017] [Indexed: 12/30/2022] Open
Abstract
Tumor hypoxia is recognized as a limiting factor for the efficacy of radiotherapy, because it enhances tumor radioresistance. It is strongly suggested that assessing tumor oxygenation could help to predict the outcome of cancer patients undergoing radiation therapy. Strategies have also been developed to alleviate tumor hypoxia in order to radiosensitize tumors. In addition, oxygen mapping is critically needed for intensity modulated radiation therapy (IMRT), in which the most hypoxic regions require higher radiation doses and the most oxygenated regions require lower radiation doses. However, the assessment of tumor oxygenation is not yet included in day-to-day clinical practice. This is due to the lack of a method for the quantitative and non-invasive mapping of tumor oxygenation. To fully integrate tumor hypoxia parameters into effective improvements of the individually tailored radiation therapy protocols in cancer patients, methods allowing non-invasively repeated, safe, and robust mapping of changes in tissue oxygenation are required. In this review, non-invasive methods dedicated to assessing tumor oxygenation with the ultimate goal of predicting outcome in radiation oncology are presented, including positron emission tomography used with nitroimidazole tracers, magnetic resonance methods using endogenous contrasts (R1 and R2*-based methods), and electron paramagnetic resonance oximetry; the goal is to highlight results of studies establishing correlations between tumor hypoxic status and patients’ outcome in the preclinical and clinical settings.
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Affiliation(s)
- Florence Colliez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
| | - Bénédicte F Jordan
- Biomedical Magnetic Resonance Group, Louvain Drug Research Institute, Université Catholique de Louvain , Brussels , Belgium
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