Suryanarayanan S, Karellas A, Vedantham S, Baker S P, Glick S J, D'Orsi C J, Webber R L
Department of Radiology, University of Massachusetts Medical School, UMass Memorial Medical Center, Worcester 01655, USA.
Acad Radiol. 2001 Mar;8(3):219-24. doi: 10.1016/S1076-6332(03)80530-5.
The purpose of this study was to comparatively evaluate digital planar mammography and both linear and nonlinear tomosynthetic reconstruction methods.
A "disk" (ie, target) identification study was conducted to compare planar and reconstruction methods. Projective data using a composite phantom with circular disks were acquired in both planar and tomographic modes by using a full-field, digital mammographic system. Two-dimensional projections were reconstructed with both linear (ie, backprojection) and nonlinear (ie, maximization and minimization) tuned-aperture computed tomographic (TACT) methods to produce three-dimensional data sets. Four board-certified radiologists and one 4th-year radiology resident participated as observers. All images were compared by these observers in terms of the number of disks identified.
Significant differences (P < .05, Bonferroni adjusted) were observed between all reconstruction and planar methods. No significant difference, however, was observed between the planar methods, and only a marginally significant difference (P < .054, Bonferroni adjusted) was observed between TACT-backprojection and TACT-minimization.
A combination of linear and nonlinear reconstruction schemes may have potential implications in terms of enhancing image visualization to provide radiologists with valuable diagnostic information.
本研究的目的是比较评估数字平板乳腺摄影以及线性和非线性断层合成重建方法。
进行了一项“圆盘”（即靶标）识别研究，以比较平板和重建方法。使用全场数字乳腺摄影系统，以平面和断层摄影模式采集带有圆形圆盘的复合体模的投影数据。使用线性（即反投影）和非线性（即最大化和最小化）调谐孔径计算机断层摄影（TACT）方法重建二维投影，以生成三维数据集。四名获得委员会认证的放射科医生和一名放射科四年级住院医师作为观察者参与。这些观察者根据识别出的圆盘数量对所有图像进行比较。
在所有重建方法和平板方法之间观察到显著差异（P <.05，经Bonferroni校正）。然而，平板方法之间未观察到显著差异，并且在TACT反投影和TACT最小化之间仅观察到微弱的显著差异（P <.054，经Bonferroni校正）。
线性和非线性重建方案的组合在增强图像可视化方面可能具有潜在意义，可为放射科医生提供有价值的诊断信息。
