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In this study, the validity of van Herk\u0027s theoretical value (precise method, approximation method) was evaluated for the purpose of examining the impact of the irradiation field shape on necessary PTV margin value. Seven types of irradiation fields with partially convex to concave shapes were prepared, and the dose distributions were calculated with the parallel opposed fields, using 4 MV X-ray and 10 MV X-ray data. Numerical simulation was carried out to add geometrical uncertainties to the dose distribution, and the deviation of the isodose line (95% of the prescribed dose) was compared with the theoretical value. The precise method was consistent with the simulation when the edge of the irradiated field was flat, but inconsistency was observed when the irregularities of the irradiation field was increased. Although the approximation method was found to be inconsistent in many cases, the range of inconsistency was smaller than that of the precise method. When calculating the PTV margin, the influence of the irradiation field shape should be taken into account.", "subitem_description_type": "Abstract"}]}, "item_7_full_name_3": {"attribute_name": "\u8457\u8005\u5225\u540d", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "164156", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "Sasamoto, Ryuta"}]}]}, "item_7_publisher_7": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u65b0\u6f5f\u5927\u5b66\u533b\u5b66\u90e8\u4fdd\u5065\u5b66\u79d1"}]}, "item_7_select_19": {"attribute_name": "\u8457\u8005\u7248\u30d5\u30e9\u30b0", "attribute_value_mlt": [{"subitem_select_item": "publisher"}]}, "item_7_source_id_11": {"attribute_name": "\u66f8\u8a8c\u30ec\u30b3\u30fc\u30c9ID", "attribute_value_mlt": [{"subitem_source_identifier": "AA12680484", "subitem_source_identifier_type": "NCID"}]}, "item_7_source_id_9": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "21884617", "subitem_source_identifier_type": "ISSN"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "\u7b39\u672c, \u9f8d\u592a"}], "nameIdentifiers": [{"nameIdentifier": "164155", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2019-08-20"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "15(1)_57-65.pdf", "filesize": [{"value": "2.2 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 2200000.0, "url": {"label": "15(1)_57-65.pdf", "url": "https://niigata-u.repo.nii.ac.jp/record/28527/files/15(1)_57-65.pdf"}, "version_id": "b6c0ee39-3961-4be8-a580-971758a6d53f"}]}, "item_keyword": {"attribute_name": "\u30ad\u30fc\u30ef\u30fc\u30c9", "attribute_value_mlt": [{"subitem_subject": "\u653e\u5c04\u7dda\u6cbb\u7642", "subitem_subject_scheme": "Other"}, {"subitem_subject": "\u7167\u5c04\u91ce\u5f62\u72b6", "subitem_subject_scheme": "Other"}, {"subitem_subject": "PTV\u30de\u30fc\u30b8\u30f3", "subitem_subject_scheme": "Other"}, {"subitem_subject": "\u5076\u7136\u8aa4\u5dee", "subitem_subject_scheme": "Other"}, {"subitem_subject": "\u7dda\u91cf\u5206\u5e03", "subitem_subject_scheme": "Other"}, {"subitem_subject": "radiotherapy", "subitem_subject_scheme": "Other"}, {"subitem_subject": "irradiation field shape", "subitem_subject_scheme": "Other"}, {"subitem_subject": "PTV margin", "subitem_subject_scheme": "Other"}, {"subitem_subject": "random geometrical uncertainty", "subitem_subject_scheme": "Other"}, {"subitem_subject": "dose distribution", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "jpn"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "departmental bulletin paper", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "\u7167\u5c04\u4f4d\u7f6e\u306e\u5076\u7136\u8aa4\u5dee\u306b\u3088\u308b\u7dda\u91cf\u5206\u5e03\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u7167\u5c04\u91ce\u306e\u5f62\u72b6\u304c\u53ca\u307c\u3059\u5f71\u97ff", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "\u7167\u5c04\u4f4d\u7f6e\u306e\u5076\u7136\u8aa4\u5dee\u306b\u3088\u308b\u7dda\u91cf\u5206\u5e03\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u7167\u5c04\u91ce\u306e\u5f62\u72b6\u304c\u53ca\u307c\u3059\u5f71\u97ff"}, {"subitem_title": "\u7167\u5c04\u4f4d\u7f6e\u306e\u5076\u7136\u8aa4\u5dee\u306b\u3088\u308b\u7dda\u91cf\u5206\u5e03\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u7167\u5c04\u91ce\u306e\u5f62\u72b6\u304c\u53ca\u307c\u3059\u5f71\u97ff", "subitem_title_language": "en"}]}, "item_type_id": "7", "owner": "1", "path": ["453/456", "506/1624/1625/1626"], "permalink_uri": "http://hdl.handle.net/10191/49819", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_value": "2018-04-05"}, "publish_date": "2018-04-05", "publish_status": "0", "recid": "28527", "relation": {}, "relation_version_is_last": true, "title": ["\u7167\u5c04\u4f4d\u7f6e\u306e\u5076\u7136\u8aa4\u5dee\u306b\u3088\u308b\u7dda\u91cf\u5206\u5e03\u306e\u5909\u5316\u306b\u5bfe\u3057\u3066\u7167\u5c04\u91ce\u306e\u5f62\u72b6\u304c\u53ca\u307c\u3059\u5f71\u97ff"], "weko_shared_id": null}