比较同一乳腺X线机2种不同压迫模式下的各个指标，评估其在乳腺X线摄影中的应用价值。

回顾性收集2018年1月至2019年11月在天津医科大学肿瘤医院进行乳腺X线摄影的患者临床资料。分别入组标准压迫模式(A组)及柔性压迫模式(B组)下行乳腺X线摄影的患者各2 000例。排除巨大肿瘤、有手术史和化疗史的患者后，最终A组1 950例，B组1 781例。用秩和检验比较2组患者图像的乳房压迫厚度(compression of breast thickness, CBT)、压力、平均腺体剂量(average glandular dose, AGD)，用χ²检验比较图像质量，用独立样本t检验比较患者疼痛评分。

2组病例图像质量全部合格，无废片。A组甲级片1 798例，乙级片132例，丙级片20例，B组甲级片1 639例，乙级片109例，丙级片33例，2组比较差异无统计学意义(χ²＝5.095，P＝0.078)。A、B组的CBT分别为44(37，51) mm和45(37，52) mm，差异无统计学意义(Z＝1.913，P＝0.056);压力分别为83(66，99) N和83(62，100) N,差异无统计学意义(Z＝1.222，P＝0.222); AGD分别为1.29(1.01, 1.63) mGy和1.30(0.98, 1.62) mGy,差异无统计学意义(Z＝0.539，P＝0.590)。2组疼痛评分分别为4.32±2.02和4.42±2.14，差异无统计学意义(t＝－0.241，P＝0.810)。

乳腺X线摄影中2种不同压迫模式不会造成图像质量和患者疼痛程度的明显差异，可以根据患者的具体情况进行个性化压迫。

To compare the parameters in two different compression modes of the same mammography machine and evaluate their application value.

The clinical data of patients who underwent mammography in the Cancer Hospital Tianjin Medical University from January 2018 to November 2019 were retrospectively collected. We enrolled 2 000 patients undergoing mammography in normal compression mode (group A) and 2 000 patients in fully automatic self-adjusting tilt mode (group B). After excluding patients with large tumors, history of surgery and chemotherapy, there were 1 950 patients in group A and 1 781 patients in group B. The compression of breast thickness (CBT), pressure, and average glandular dose (AGD) were compared between two groups by rank sum test. The image quality was compared by χ² test. The pain score of the patients was compared by independent sample t test.

The X-ray images of patients in two groups were all qualified, and there were no waste films. There were 1798 cases of grade A films, 132 grade B films and 20 grade C films in group A, 1639, 109 and 33 in group B, suggesting no significant difference between two groups (χ²=5.095, P=0.078). The CBT in groups A and B was 44(37, 51) mm and 45(37, 52) mm, respectively, suggesting no significant difference (Z=1.913, P=0.056). The pressure in groups A and B was 83(66, 99) N and 83(62, 100) N, respectively, with no significant difference (Z=1.222, P=0.222). AGD in groups A and B was 1.29(1.01, 1.63) mGy and 1.30 (0.98, 1.62) mGy, respectively, with no significant difference (Z=0.539, P=0.590). The pain score was 4.32±2.02 in group A and 4.42±2.14 in group B, respectively, suggesting no significant difference (t=-0.241, P=0.810).

The two compression modes in mammography lead to no obvious difference in image quality and pain of patients, so compression can be individualized depending on the patient’s condition.