Background

Application of an endorectal coil (ERC) for 3.0-T prostate magnetic resonance imaging (MRI) is contentious. We hypothesised that a multicoil phased-array protocol provides T2-weighted images (T2WI) and diffusion-weighted images (DWI) with reduced field-of-view (DWI_reduced) and monoexponential apparent diffusion coefficient (ADC) maps that are technically equivalent with ERC or without ERC (noERC).

Methods

Axial T2WI (repetition time [TR] 7500 ms, echo time [TE] 98–101 ms) and DWI_reduced (field-of-view 149–179 × 71–73 mm², TR/TE 4500–5500/61–74 ms, b values, 50/800 s/mm²) ERC and noERC images were obtained on identical clinical 3.0-T scanners at two centres and compared for signal-to-noise ratio (SNR) in anterior and posterior outer pericarp (OP) and peripheral placenta (PP) in five green Hayward kiwifruit (Actinidia deliciosa, European Union regulation 543/2011 class 2). Corroboration in 21 patients with benign prostate hyperplasia (negative biopsy, prostate imaging reporting and data system version 2 ≤ 2) involved identical MRI protocols: 10 at site 1, noERC, and 11 at site 2, with ERC. Two-tailed Student’s t test was used.

Results

With few exceptions, signal-to-noise ratio (SNR) was similar in kiwifruits and prostates for ERC and noERC. In T2WI, SNR was higher posteriorly in noERC MRI for peripheral zone (PZ) (p < 0.001). In DWI_reduced, SNR was higher posteriorly in ERC-OP (p = 0.013) and ERC-PZ (p = 0.026) for b = 50 s/mm²; noERC-OP (p = 0.044) and ERC-PZ (p = 0.001) for b = 800 s/mm²; and ERC-OP (p = 0.001), noERC-OP (p = 0.001), and ERC-PZ (p = 0.001) for ADC, respectively. Volumes of kiwifruits and prostates were similar (89.2 ± 11.2 versus 90.8 ± 48.5 cm³, p = 0.638–0.920).

Conclusions

Findings imply that multicoil phased-array 3.0-T prostate MRI with T2WI and DWI_reduced with ADC maps provides equivalent results with and without ERC.

中文翻译：

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奇异果（Actinidia deliciosa）作为人体前列腺模型，在有和没有直肠内线圈的情况下，在3.0 T下双参数MRI的两中心对比实验研究。

背景

直肠内线圈（ERC）在3.0-T前列腺磁共振成像（MRI）中的应用存在争议。我们假设多线圈相控阵协议提供的T2加权图像（T2WI）和扩散加权图像（DWI）的视场_缩小（DWI_减少）和单指数视在扩散系数（ADC）映射在技术上与ERC或不带ERC（noERC）。

方法

轴向T2WI（重复时间[TR] 7500毫秒，回波时间[TE] 98-101毫秒）和DWI_减小（视场149-179×71-73 mm ²，TR / TE 4500-5500 / 61-74 ms，b值，50/800 s / mm ²）在两个中心的相同临床3.0-T扫描仪上获得了ERC和noERC图像，并比较了前，后外果皮（OP）的信噪比（SNR）和五个绿色Hayward奇异果（Actinidia delicios a，欧盟法规543/2011 2类）中的果皮和外周胎盘（PP ）。在21例前列腺良性增生（阴性活检，前列腺成像报告和数据系统版本2≤2）中的确证涉及相同的MRI方案：第1部位为10，noERC，第11部位为2，具有ERC。两尾学生使用t检验。

结果

除少数例外，对于ERC和noERC，猕猴桃和前列腺中的信噪比（SNR）相似。在T2WI中，noERC MRI对周围区域（PZ）的信噪比在后方更高（p  <0.001）。在_降低的DWI中，b  = 50 s / mm ^2时，ERC-OP（p  = 0.013）和ERC-PZ（p  = 0.026）的SNR更高。 对于b  = 800 s / mm ²，没有eERC-OP（p  = 0.044）和ERC-PZ（p = 0.001）；和ERC-OP（p  = 0.001），noERC-OP（p  = 0.001）和ERC-PZ（p = 0.001）。奇异果和前列腺的体积相似（89.2±11.2对90.8±48.5 cm ³，p  = 0.638–0.920）。

结论

研究结果表明，采用ADC谱图可_减少T2WI和DWI的多线圈相控阵3.0-T前列腺MRI在使用和不使用ERC的情况下均能提供等效的结果。