Makowski Marcus R, Jonczyk Martin, Streitparth Florian, Guettler Felix, Rathke Hendrik, Suttmeyer Britta, Albrecht Liane, Teichgräber Ulf K, Hamm Bernd, de Bucourt Maximilian
Biomed Tech (Berl). 2015 Dec;60(6):533-9. doi: 10.1515/bmt-2014-0118.
Different techniques for magnetic resonance-guided lumbar interventions have been introduced in recent years. Appropriate pulse sequence design is crucial since high spatial resolution often comes at the cost of lower temporal resolution. The purpose of this study was to evaluate the value of accelerated reduced field of view (ZOOM)-based imaging sequences for lumbar interventions.
ZOOM imaging was used in 31 interventions (periradicular, facet joint, epidural infiltrations, and discography) performed in 24 patients (10 women, 14 men; age 43 ± 13.3 years). Signal-to-noise ratio and contrast-to-noise ratio (CNR) were determined and retrospectively compared with standard preinterventional (T2 weighted), peri-interventional (proton density), and postinterventional (spectral presaturation with inversion recovery [SPIR]) imaging. Needle artifacts were assessed by direct measurement as well as with parallel and perpendicular needle profiles. Puncture times were compared to similar interventions previously performed in our department.
No significant differences in signal intensities (standard/ZOOM: 152.0/151.6; p=0.136) and CNR values (2.0/4.0; p=0.487) were identified for T2-weighted sequences. The needle artifact signal intensity was comparable (648.1/747.5; p=0.172) for peri-interventional imaging. Standard interventional (fat needle: 43.8/23.4; p<0.001; muscle needle: 6.2/2.4; p<0.001) and SPIR sequences (43.3/13.9; p=0.010) showed a higher CNR than corresponding ZOOM sequences did. Needle artifacts were larger in ZOOM (2.4 mm/2.9 mm; p=0.005). The profiles revealed that ZOOM imaging delivers more overall signal intensity. The turning points of both profiles were comparable. ZOOM reduced intervention times significantly (329.1 s/228.5 s; p=0.026).
ZOOM imaging is a feasible interactive sequence for lumbar interventions. It ameliorates the tradeoff between image quality and temporal resolution. Moreover, the sequence design reduces intervention times significantly.
近年来已引入了多种用于磁共振引导下腰椎介入治疗的技术。合适的脉冲序列设计至关重要，因为高空间分辨率往往是以较低的时间分辨率为代价的。本研究的目的是评估基于加速缩小视野（ZOOM）的成像序列在腰椎介入治疗中的价值。
对24例患者（10名女性，14名男性；年龄43±13.3岁）进行的31项介入治疗（神经根周围、小关节、硬膜外注射及椎间盘造影）采用了ZOOM成像。测定信噪比和对比噪声比（CNR），并与标准介入前（T2加权）、介入期间（质子密度）和介入后（反转恢复频谱预饱和[SPIR]）成像进行回顾性比较。通过直接测量以及平行和垂直针状轮廓评估针状伪影。将穿刺时间与我们科室之前进行的类似介入治疗进行比较。
T2加权序列在信号强度（标准/ZOOM：152.0/151.6；p=0.136）和CNR值（2.0/4.0；p=0.487）方面未发现显著差异。介入期间成像的针状伪影信号强度相当（648.1/747.5；p=0.172）。标准介入（脂肪针：43.8/23.4；p<0.001；肌肉针：6.2/2.4；p<0.001）和SPIR序列（43.3/13.9；p=0.010）的CNR高于相应的ZOOM序列。ZOOM中的针状伪影更大（2.4 mm/2.9 mm；p=0.005）。轮廓显示ZOOM成像提供了更多的总体信号强度。两个轮廓的转折点相当。ZOOM显著缩短了介入时间（329.1 s/228.5 s；p=0.026）。
ZOOM成像是一种适用于腰椎介入治疗的可行交互序列。它改善了图像质量和时间分辨率之间的权衡。此外，序列设计显著缩短了介入时间。
