| T2*-weighted image/T2-weighted image fusion in postimplant dosimetry of prostate brachytherapy. | |
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MedLine Citation:
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PMID: 21857148 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Computed tomography (CT)/magnetic resonance imaging (MRI) fusion is considered to be the best method for postimplant dosimetry of permanent prostate brachytherapy; however, it is inconvenient and costly. In T2*-weighted image (T2*-WI), seeds can be easily detected without the use of an intravenous contrast material. We present a novel method for postimplant dosimetry using T2*-WI/T2-weighted image (T2-WI) fusion. We compared the outcomes of T2*-WI/T2-WI fusion-based and CT/T2-WI fusion-based postimplant dosimetry. Between April 2008 and July 2009, 50 consecutive prostate cancer patients underwent brachytherapy. All the patients were treated with 144 Gy of brachytherapy alone. Dose-volume histogram (DVH) parameters (prostate D90, prostate V100, prostate V150, urethral D10, and rectal D2cc) were prospectively compared between T2*-WI/T2-WI fusion-based and CT/T2-WI fusion-based dosimetry. All the DVH parameters estimated by T2*-WI/T2-WI fusion-based dosimetry strongly correlated to those estimated by CT/T2-WI fusion-based dosimetry (0.77 ≤ R ≤ 0.91). No significant difference was observed in these parameters between the two methods, except for prostate V150 (p = 0.04). These results show that T2*-WI/T2-WI fusion-based dosimetry is comparable or superior to MRI-based dosimetry as previously reported, because no intravenous contrast material is required. For some patients, rather large differences were observed in the value between the 2 methods. We thought these large differences were a result of seed miscounts in T2*-WI and shifts in fusion. Improving the image quality of T2*-WI and the image acquisition speed of T2*-WI and T2-WI may decrease seed miscounts and fusion shifts. Therefore, in the future, T2*-WI/T2-WI fusion may be more useful for postimplant dosimetry of prostate brachytherapy. |
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Authors:
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Norihisa Katayama; Mitsuhiro Takemoto; Kotaro Yoshio; Kuniaki Katsui; Tatsuya Uesugi; Yasutomo Nasu; Toshi Matsushita; Mitsumasa Kaji; Hiromi Kumon; Susumu Kanazawa |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2011-08-20 |
Journal Detail:
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Title: Journal of radiation research Volume: 52 ISSN: 1349-9157 ISO Abbreviation: J. Radiat. Res. Publication Date: 2011 |
Date Detail:
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Created Date: 2011-09-28 Completed Date: 2012-01-26 Revised Date: 2012-03-28 |
Medline Journal Info:
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Nlm Unique ID: 0376611 Medline TA: J Radiat Res Country: Japan |
Other Details:
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Languages: eng Pagination: 680-4 Citation Subset: IM |
Affiliation:
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Department of Radiology, Japanese Red Cross Society Himeji Hospital, Japan. n-katayama@bea.hi-ho.ne.jp |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Brachytherapy* Humans Iodine Radioisotopes / administration & dosage, therapeutic use Magnetic Resonance Imaging Male Prostatic Neoplasms / radiography, radiotherapy* Radiotherapy Dosage Radiotherapy Planning, Computer-Assisted Tomography, X-Ray Computed |
| Chemical | |
Reg. No./Substance:
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0/Iodine Radioisotopes |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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