大乳房乳房x线摄影:使用两种不同胶片格式的图像质量和辐射剂量的比较研究

A.D. Oldenborg , J.G. Stalheim , H.S. Aase , J. Rørvik
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引用次数: 1

摘要

目的比较18 × 24 cm和24 × 30 cm两种不同胶片格式下大乳房乳房x光片图像质量和平均腺剂量(AGD)的差异,并探讨影响这些差异的因素。材料和方法197名乳房过大而无法在标准18 × 24厘米胶片上成像的女性,在两种胶片上对一个乳房进行了同一视图的成像。使用模拟乳房x线摄影装置。马赛克技术与18 × 24厘米的格式结合使用。一个幻影研究被用来比较空间分辨率和对比度两种格式在不同的幻影厚度。使用参数比较格式在主观图像质量上的差异;清晰度,对比度,定位和压缩。使用马赛克技术计算了多次暴露的乳腺组织的数量。计算了每种胶片格式的AGD,并根据在马赛克技术期间多次曝光的区域进行调整。结果两种格式的空间分辨率和对比度均随模体厚度的增加而降低。24 × 30 cm格式乳头-乳晕区域的空间分辨率较18 × 24 cm格式差。与24 × 30 cm f.f.相比,使用马赛克技术的所有参数的图像质量相同或改善,但颅尾图像的pgmi系统评估(完美,良好,中等,不足)除外。与24 × 30 cm胶片格式相比,使用马赛克技术的女性平均获得0.77 mGy(41.6%)的高AGD。结论采用18 × 24 cm格式和拼接技术,图像质量有明显提高。镶嵌技术的AGD比24 × 30 cm f.f更高。
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Mammography of the large breast: A comparison study of image quality and radiation dose using two different film formats

Aim

To compare the differences in image quality and average glandular dose (AGD) of mammograms of the large breast using two different film formats: 18 × 24 cm and 24 × 30 cm, and explore factors affecting these differences.

Materials and methods

197 women with breasts too large to be imaged on the standard 18 × 24 cm film format (f.f.) had one breast imaged in one view on both film formats. An analogue mammography unit was used. A mosaic technique was used in conjunction with the 18 × 24 cm format. A phantom study was used to compare spatial resolution and contrast of both formats at differing phantom thicknesses. The formats were compared for differences in subjective image quality using the parameters; sharpness, contrast, positioning and compression. The amount of breast tissue exposed more than once using the mosaic technique was calculated. The AGD was calculated for each film format, adjusting for the area exposed more than once during the mosaic technique.

Results

Spatial resolution and contrast decreased with increasing phantom thickness on both formats. Spatial resolution was poorer in the nipple-areolar area on the 24 × 30 cm format than the 18 × 24 cm format. There was equal or improved image quality on all parameters using the mosaic technique when compared with the 24 × 30 cm f.f. with the exception of evaluation by the PGMI-system (Perfect, Good, Moderate, Inadequate) of the cranio-caudal images. Women received an average of 0.77 mGy (41.6%) higher AGD when the mosaic technique was used as compared to the 24 × 30 cm film format.

Conclusion

There is a marked improvement in image quality in the use of the 18 × 24 cm format and mosaic technique. Mosaic technique results in a higher AGD than the 24 × 30 cm f.f.

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