多排螺旋CT心脏收缩期与舒张期对比测量研究

目的 通过64排螺旋CT心电门控技术获得心脏收缩末期与舒张末期图像，以心脏四心腔分界线为测量基线，对比分析心脏两时相各心腔正常值范围及变化规律。方法 回顾性分析133例健康受检者收缩末期与舒张末期CT图像，分别测量并统计得到各心腔的左右径（RL）与前后径（AP）的95%可信区间（95%CI），并对各心腔收缩末期与舒张末期测量值进行对比分析。结果 左、右心房AP与RL在收缩末期大于舒张末期（P＜0.05），左、右心室RL与AP在舒张末期大于收缩末期（P＜0.05）。左/右心房RL径线比值、左/右心室RL径线比值、左/右心室AP径线比值均大于1，并且收缩末期大于舒张末期（P＜0.05）。左/右心房AP径线比值小于1，收缩末期小于舒张末期（P＜0.05）。收缩末期与舒张末期对比，左心房RL:AP值两期之间差异无统计学意义（P＞0.05），余所测各心腔参数比值变化两期之间差异均有统计学意义（P＜0.05）。左心室角(β)在收缩末期与舒张末期之间对比差异无统计学意义（P＞0.05）。结论 通过测量心脏收缩末期与舒张末期的各径线值及β角大小，利用多排螺旋CT能统计分析其变化规律及 95%CI，并初步得出心腔径线的范围与上限值，从而为进一步探索利用非增强胸部CT图像观测各心腔大小提供了理论依据。

Contrast of cardiac measurements between systolic and diastolic with multi slice spiral CT

Objective Cardiac end systolic and end diastolic images were obtained by 64 slice spiral CT ECG gating technique. Then, theborderline of the four heart chambers as the measurement baseline, the normal range of the heart chambers were measured and analyzed, and the characteristics were compared between the two phases.Methods Retrospective analysis of cardiac end systolic and end diastolic CT images was performed on 133 healthy subjects.The 95% confidence interval (CI) of the left to right diameter (RL) and the anteroposterior diameter (AP) of the heart chambers were measured separately and analyzed statistically. And the end systolic and end diastolic measurements were compared and analyzed. Results In the end systolic phase, the AP and RL of the left and right atrium were significantly greater than those in the end diastolic phase (P<0.05). For left and right ventricles, theRL and AP in end diastolic phase were significantly larger than that in end systolic (P<0.05). The RL ratio of Left/ right atrial, the RL ratio of left / right ventricular and the AP ratio of left/right ventricular were greater than 1, and in the end systolic phase significantly greater than in the end diastolic phase (P<0.05). The AP ratio ofleft/right atrium was less than 1, with that in the end systolic phase being significantly less than that in the end diastolic phase (P<0.05).There was no significant difference in left atrium RL: AP between the two phases (P>0.05), and the rest ratio of each cardiac cavity parameters had significant difference between the two phases.Left ventricular angle (β) between end systolic and end diastolic contrast was no significant difference (P>0.05). Conclusion By means of measuring the cardiac diameters in the end systolic and end diastolic phases, the characteristics and 95%CI were statistically analyzed with multi slice spiral CT, and the range and upper limit was obtained. Thus, it provides a theoretical basis for further exploration of the use of non enhanced chest CT images to observe the size of each cardiac cavity.