In vitro artefact assessment of a new MR-compatible microwave antenna and a standard MR-compatible radiofrequency ablation electrode for tumour ablation
In vitro artefact assessment of a new MR-compatible microwave antenna and a standard MR-compatible radiofrequency ablation electrode for tumour ablation
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DOI：
10.1007/s00330-015-3891-0
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发表时间：
2016-03-01
影响因子：
5.9
通讯作者：
Clasen, Stephan
中科院分区：
文献类型：
--
作者：
Hoffmann, Ruediger;Rempp, Hansjoerg;Clasen, Stephan
为了评估和比较磁共振(MR)兼容的微波(MW)原型和标准MR引导的射频(RF)肿瘤消融器中的伪影形状和直径，在1.5T的体模研究中对这两个应用器进行了三种序列的测试：T1加权三维体积内插屏气检查(VIBE)、T1加权快速低角度激发(FLASH)、T2加权涡轮自旋回波(TSE)。涂抹器对主磁场(B-0)的取向和切片方向是不同的。评估针尖定位误差(TLE)，计算伪影直径。成像参数对伪影的影响通过方差分析(ANOVA)和后处理检验进行评估。微波敷贴器：轴心伪影直径2.3±0.8 mm。尖端伪影直径和长度分别为2.2±0.8 mm和2.4±1.3 mm。尖端附近可见一明显的椭圆形伪影(直径16.5±1.8 mm，长度19.1±2.5 mm)。TLE：-0.3+/-0.6 mm。射频敷贴器：轴直径为8.9±-4.7 mm，尖端直径为9.0±-0 mm。TLE：-0.1+/-0.8 mm。当射频敷贴器方向平行于B-0.0001(P<；0.05)时，测量到最小的伪影，而微波敷贴器则没有这种影响。对于两个敷贴器，T1闪光测量到明显的大伪影(P=0.03)。微波敷贴器的伪影令人满意，似乎可用于MR引导的消融程序。欧元分微波敷贴器的伪影外观与与主磁场的夹角无关。欧元分微波敷贴器的突出远端伪影可以增加MR引导下的可见度。欧元分射频和微波敷贴器的伪影在尖端描绘方面是精确的。欧元分的最大伪影直径是用T1加权的快速低角度激发序列测量的。
To evaluate and compare artefact configuration and diameters in a magnetic resonance (MR)-compatible prototype microwave (MW) applicator and a standard MR-compatible radiofrequency (RF) applicator for MR-guided tumour ablation.Both applicators were tested in a phantom study at 1.5T with three sequences: T1-weighted three-dimensional volume interpolated breath-hold examination (VIBE), T1-weighted fast low angle shot (FLASH), T2-weighted turbo spin echo (TSE). Applicator orientation to main magnetic field (B-0) and slice orientation were varied. Needle tip location error (TLE) was assessed, and artefact diameters were calculated. Influence of imaging parameters on artefacts was assessed with analysis of variance (ANOVA) and post hoc testing.MW applicator: the shaft artefact diameter measured 2.3 +/- 0.8 mm. Tip artefact diameter and length measured 2.2 +/- 0.8 mm and 2.4 +/- 1.3 mm, respectively. A prominent oval artefact (diameter: 16.5 +/- 1.8 mm, length: 19.1 +/- 2.5 mm) appeared close to the tip. TLE: - .3 +/- 0.6 mm. RF applicator: shaft and tip diameter measured 8.9 +/- 4.7 mm and 9.0 +/- .0 mm, respectively. TLE: -0.1 +/- 0.8 mm. Minimal artefacts were measured with RF applicator orientation parallel to B-0 (P < 0.0001), whereas no such influence was found for MW applicator. For both applicators, significantly large artefacts were measured with T1 FLASH (P = 0.03).The MW applicator's artefact is satisfactory and seems useable for MR-guided ablation procedures.aEuro cent MW applicator's artefact appearance is independent of angulation to main magnetic field.aEuro cent MW applicator's prominent distal artefact may increase visibility under MR-guidance.aEuro cent RF and MW applicator's artefacts are precise concerning tip depiction.aEuro cent Largest artefact diameters are measured with T1-weighted fast low angle shot sequence.