Evaluation of electrical impedance tomography for determination of urinary bladder volume: comparison with standard ultrasound methods in healthy volunteers.

Evaluation of electrical impedance tomography for determination of urinary bladder volume: comparison with standard ultrasound methods in healthy volunteers.
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DOI:
10.1186/s12938-018-0526-0
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发表时间:
2018-07-13
影响因子:
3.9
通讯作者:
Grosse JO
Grosse JO
中科院分区:
工程技术3区
文献类型:
--
作者:
Leonhäuser D;Castelar C;Schlebusch T;Rohm M;Rupp R;Leonhardt S;Walter M;Grosse JO

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连续无创膀胱容量测量(膀胱容量术)将有助于更好地管理尿路疾病。电阻抗断层扫描 (EIT) 是克服非连续超声测量局限性的一种有前途的方法。本研究的目的是比较健康志愿者中 EIT 与标准超声的测量准确性。对于膀胱 EIT,使用商业设备 (Goe MF II),将 16 个标准 ECG 电极的 4 种不同配置连接到健康参与者的下腹部。为了估计最大膀胱容量 (BCmax) 和残余尿 (RU),在紧急情况下和排尿后进行了两种超声方法(US-Ellipsoid 和 US-L × W × H)和床边膀胱扫描仪 (BS)。作为体积参考,BCmax 和 RU 通过在体重测量罐中收集尿液进行验证。离线使用全局阻抗方法从 EIT 估计 BCmax 和 RU。 US-Ellipsoid (37±±17%) 和 US-L±×±W±×±H (36±±15%) 和 EIT (32±±18%) 的平均误差在归一化至水罐体积法的 BCmax(平均 743±±200 ml)估计中没有显着差异。 BS 的准确度明显较差 (55±9%)。与 US-Ellipsoid (54±25%) 相比,RU 体积(平均 152.1±±64 ml)显示 EIT (72±±58%) 和 BS (63±±24%) 的误差较高。对于 RU,EIT 精度取决于电极配置,因为条纹 (41±25%) 和矩阵 (38±27%) 配置显示出明显优于 1××16 (116±62%) 配置的精度。 EIT 膀胱容积术与超声技术相比效果很好。对于 RU 的估计,EIT 电极配置的选择很重要。此外,算法的开发应考虑运动伪影的影响。最后,应重新考虑作为膀胱容量金标准的非侵入性超声的准确性。
Continuous non-invasive urinary bladder volume measurement (cystovolumetry) would allow better management of urinary tract disease. Electrical impedance tomography (EIT) represents a promising method to overcome the limitations of non-continuous ultrasound measurements. The aim of this study was to compare the measurement accuracy of EIT to standard ultrasound in healthy volunteers. For EIT of the bladder a commercial device (Goe MF II) was used with 4 different configurations of 16 standard ECG electrodes attached to the lower abdomen of healthy participants. To estimate maximum bladder capacity (BCmax) and residual urine (RU) two ultrasound methods (US-Ellipsoid and US-L × W × H) and a bedside bladder scanner (BS), were performed at the point of urgency and after voiding. For volume reference, BCmax and RU were validated by urine collection in a weight measuring pitcher. The global impedance method was used offline to estimate BCmax and RU from EIT. The mean error of US-Ellipsoid (37 ± 17%) and US-L × W × H (36 ± 15%) and EIT (32 ± 18%) showed no significant differences in the estimation of BCmax (mean 743 ± 200 ml) normalized to pitcher volumetry. BS showed significantly worse accuracy (55 ± 9%). Volumetry of RU (mean 152.1 ± 64 ml) revealed comparable higher errors for both EIT (72 ± 58%) and BS (63 ± 24%) compared to US-Ellipsoid (54 ± 25%). In case of RU, EIT accuracy is dependent on electrode configuration, as the Stripes (41 ± 25%) and Matrix (38 ± 27%) configurations revealed significantly superior accuracy to the 1 × 16 (116 ± 62%) configuration. EIT-cystovolumetry compares well with ultrasound techniques. For estimation of RU, the selection of the EIT electrode configuration is important. Also, the development of an algorithm should consider the impact of movement artefacts. Finally, the accuracy of non-invasive ultrasound accepted as gold standard of cystovolumetry should be reconsidered.
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