{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1363670318525977600.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1118/1.598804"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1118%2F1.598804"}},{"identifier":{"@type":"URI","@value":"https://aapm.onlinelibrary.wiley.com/doi/pdf/10.1118/1.598804"}},{"identifier":{"@type":"NAID","@value":"30016013871"}}],"dc:title":[{"@value":"The effect of pitch in multislice spiral/helical CT"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>The purpose of this study is to understand the effect of pitch on raw data interpolation in multislice spiral/helical computed tomography (CT) and provide guidelines for scanner design and protocol optimization. Multislice spiral CT is mainly characterized by the three parameters: the number of detector arrays, the detector collimation, and the table increment per x‐ray source rotation. The pitch in multislice spiral CT is defined as the ratio of the table increment over the detector collimation in this study. In parallel to the current framework for studying longitudinal image resolution, the central fan‐beam rays of direct and opposite directions are considered, assuming a narrow cone‐beam angle. Generally speaking, sampling in the Radon domain by the direct and opposite central rays is nonuniform along the longitudinal axis. Using a recently developed methodology for quantifying the sensitivity of signal reconstruction from nonuniformly sampled finite points, the effect of pitch on raw data interpolation is analyzed in multislice spiral CT. Unlike single‐slice spiral CT, in which image quality decreases monotonically as the pitch increases, the sensitivity of raw data interpolation in multislice spiral CT increases in an alternating way as the pitch increases, suggesting that image quality does not decrease monotonically in this case. The most favorable pitch can be found from the sensitivity‐pitch plot for any given set of multislice spiral CT parameters. An example for four‐slice spiral CT is provided. The study on the effect of pitch using the sensitivity analysis approach reveals the fundamental characteristics of raw data interpolation in multislice spiral CT, and gives insights into interaction between pitch and image quality. These results may be valuable for design of multislice spiral CT scanners and imaging protocol optimization in clinical applications.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1581135651390092544","@type":"Researcher","foaf:name":[{"@value":"Ge Wang"}]},{"@id":"https://cir.nii.ac.jp/crid/1383670318525977601","@type":"Researcher","foaf:name":[{"@value":"Michael W. Vannier"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00942405"},{"@type":"EISSN","@value":"24734209"}],"prism:publicationName":[{"@value":"Medical Physics"}],"dc:publisher":[{"@value":"Wiley"}],"prism:publicationDate":"1999-12","prism:volume":"26","prism:number":"12","prism:startingPage":"2648","prism:endingPage":"2653"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1118%2F1.598804"},{"@id":"https://aapm.onlinelibrary.wiley.com/doi/pdf/10.1118/1.598804"}],"createdAt":"2002-07-26","modifiedAt":"2023-10-05","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1361697223511698688","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Improvement in image quality of noncontrast head images in multidetector-row CT by volume helical scanning with a three-dimensional denoising filter"}]},{"@id":"https://cir.nii.ac.jp/crid/1361697223511774976","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Comparison of 16-multidetector-row computed tomography and angiocardiography for evaluating the central pulmonary artery diameter and pulmonary artery index in children with congenital heart disease"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206389158912","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"マイクロディスク法によるMulti-slice Spiral CTの体軸方向のMTF測定 : ビーズ法との比較と幾何学的な影響に関する検討"},{"@language":"en","@value":"Measurement of Modulation Transfer Function in Z-axis for Multi-slice Spiral CT Using the Micro-disk Method : Comparison with the Bead Method and Examination of Geometric Influence"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206389286656","@type":"Article","relationType":["isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"CT検査のワークフロー改善のために考案された新しい画像フィルタの特性評価"},{"@language":"en","@value":"Characteristic of Evaluation of New Image Filter Devised for Improvement of Workflow in CT Examination"},{"@value":"臨床技術 CT検査のワークフロー改善のために考案された新しい画像フィルタの特性評価"},{"@language":"ja-Kana","@value":"リンショウ ギジュツ CT ケンサ ノ ワークフロー カイゼン ノ タメニ コウアン サレタ アタラシイ ガゾウ フィルタ ノ トクセイ ヒョウカ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206389830016","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"高心拍領域におけるMDCTの心臓イメージングの画質に関する評価 : 心臓動態ファントムによる検討を中心に"},{"@language":"en","@value":"Improving Coronary Artery Imaging Quality in the High Heart Rate Region and on MDCT Using a Pulsating Cardiac Phantom"},{"@language":"ja-Kana","@value":"コウシンパク リョウイキ ニ オケル MDCT ノ シンゾウ イメージング ノ ガシツ ニ カンスル ヒョウカ シンゾウ ドウタイ ファントム ニ ヨル ケントウ オ チュウシン ニ"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206390480768","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"multi-slice CT(MSCT)における面内空間分解能の基礎的検討"},{"@language":"en","@value":"Basic Examination of in-Plane Spatial Resolution in Multi-slice CT"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681360938496","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"不均等型検出器を有するmulti-slice CTのSSPzと画像ノイズの基礎的検討"},{"@language":"en","@value":"Basic Examination of Section Sensitivity Profile on Z-axis and Image Noise in Multi-slice CT Using Asymmetric-type Detector"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681365521536","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Influence Rotation Speed of X-ray Computed Tomography on Image Quality"},{"@language":"ja","@value":"X線CTにおけるX線管回転速度の高速化が画質に与える影響"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681367703680","@type":"Article","relationType":["isReferencedBy","isCitedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"フラクタル次元解析を用いた4Row Multislice Spiral CTにおけるZ方向のデータ乗換えの複雑性評価"},{"@language":"en","@value":"Complexity Evaluation of Data Transfer in the Z-axis Direction in 4Row Multislice Spiral CT Using Fractal Dimension 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