Monserrat Teresa, Prieto Elena, Barbés Benigno, Pina Luis, Elizalde Arlette, Fernández Belén
1 Hospital Universitario Central de Asturias, Oviedo, Spain.
2 Clínica Universidad de Navarra, Pamplona, Spain.
Acta Radiol. 2018 Jun;59(6):649-656. doi: 10.1177/0284185117730100. Epub 2017 Sep 4.
Background In 2014, Siemens developed a new software-based scatter correction (Progressive Reconstruction Intelligently Minimizing Exposure [PRIME]), enabling grid-less digital mammography. Purpose To compare doses and image quality between PRIME (grid-less) and standard (with anti-scatter grid) modes. Material and Methods Contrast-to-noise ratio (CNR) was measured for various polymethylmethacrylate (PMMA) thicknesses and dose values provided by the mammograph were recorded. CDMAM phantom images were acquired for various PMMA thicknesses and inverse Image Quality Figure (IQF) was calculated. Values of incident entrance surface air kerma (ESAK) and average glandular dose (AGD) were obtained from the DICOM header for a total of 1088 pairs of clinical cases. Two experienced radiologists compared subjectively the image quality of a total of 149 pairs of clinical cases. Results CNR values were higher and doses were lower in PRIME mode for all thicknesses. IQF values in PRIME mode were lower for all thicknesses except for 40 mm of PMMA equivalent, in which IQF was slightly greater in PRIME mode. A mean reduction of 10% in ESAK and 12% in AGD in PRIME mode with respect to standard mode was obtained. The clinical image quality in PRIME and standard acquisitions resulted to be similar in most of the cases (84% for the first radiologist and 67% for the second one). Conclusion The use of PRIME software reduces, in average, the dose of radiation to the breast without affecting image quality. This reduction is greater for thinner and denser breasts.
2014年，西门子开发了一种基于软件的新型散射校正技术（渐进式重建智能降低辐射量[PRIME]），实现了无网格数字乳腺摄影。目的：比较PRIME（无网格）模式和标准（有反散射网格）模式下的辐射剂量和图像质量。材料与方法：测量不同厚度聚甲基丙烯酸甲酯（PMMA）的对比噪声比（CNR），并记录乳腺摄影仪提供的剂量值。采集不同厚度PMMA的CDMAM体模图像，并计算反向图像质量因子（IQF）。从DICOM头文件中获取总共1088对临床病例的入射体表空气比释动能（ESAK）和平均腺体剂量（AGD）值。两名经验丰富的放射科医生对总共149对临床病例的图像质量进行主观比较。结果：在所有厚度下，PRIME模式的CNR值更高，剂量更低。除了40毫米等效PMMA外，PRIME模式在所有厚度下的IQF值都更低，其中PRIME模式下的IQF略高。与标准模式相比，PRIME模式下ESAK平均降低10%，AGD平均降低12%。在大多数情况下，PRIME模式和标准模式下采集的临床图像质量相似（第一位放射科医生认为84%相似，第二位放射科医生认为67%相似）。结论：使用PRIME软件平均可降低乳腺的辐射剂量，且不影响图像质量。对于较薄和较致密的乳房，这种剂量降低幅度更大。
