Name: protocol for the evaluation of mri artifacts caused by metal implants to assess the suitability of implants and the vulnerability of pulse sequences
Uploaded: 2018-05-17T14:00:00
Description: Watch this Scientific Journal Video about Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences at JoVE.c

作者想感谢萨, 药剂师的药房在海德堡大学医院, 她对 MRI 幻影的贡献。此外, 我们还要感谢 NORAS MRI 产品有限公司 (Höchberg, 德国), 特别是丹尼尔 Gareis 提供了一个原型的16通道多用途线圈。此外, 我们感谢与西门子医疗有限公司 (埃尔兰根, 德国) 的友好合作, 特别是 Nittka 为他们的顺序设置协助。

1. 幻像准备
<ol><li>使用水驱方法确定种植体体积 (例如)。 注: CCT t 样品的容积和 Z t 样品分别测量了0.65 毫升和0.73 毫升。</li>
	<li>使用细螺纹固定在非铁磁、塑料、防水盒中间的植入位置。使用大于预期的 MRI 工件的框。 注: 如果没有对植入物和/或脉冲序列的工件体积进行粗略估计, 则通过将幻像放置在一个盒子中, 在大约10x 大于幻影的范围内填充水来进行测试扫描。本研究的工件体?...

<ol>
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金属植入物患者的数量和 MRI 检查的数量目前正在增加1,2,3。在过去, 关节置换术后, MRI 检查被避免。然而今天, MRI 不仅被要求成像这样的病人, 但也应允许评估并发症直接毗邻关节置换术。因此, 植入物的 mri 安全性和 mri 适用性以及金属工件抑制的鲁棒脉冲序列正变得越来越重要13。为评价 MRI 在工件体积方面...

MRI 已成为不可缺少的诊断工具。因此, 常规诊断中使用的 MRI 系统的数量进一步增加了1。同时, 植入物的患者数量也在增加,2,3。例如, 在 2012年, 超过100万膝关节置换术在美国单独执行了4。在 2010年, 这种植入物的流行率约为 700万, 这相当于80-89 岁5年龄组中10% 以上的女性。因此, MRI 检查的图像质量和诊断意义往往因金属植入物造成的工件受损, 导致诊断准确性降低。因此, 植入物的 MRI 适用性和脉冲序列的工件易损性变得越来越重要。已经发表了许多方法来评估这些特点。然而, 由于使用的评价方法存在很强的差异, 因此很难对各自的结果进行比较。
通过计算其磁化率6, 可以对材料的 MRI 适用性进行评估。然而, 不同的脉冲序列对工件的脆弱性不能与给定植入物的方法相比。反之亦然, 给定脉冲序列的工件卷只能粗略估计不同的植入物. 此外, 分析通常使用人工成形的植入物7,8。由于材料体积和形状对工件大小有影响6, 因此也应考虑这些特性。作为磁易感性的替代品, 工件的尺寸可以被评估。通常, 研究只依赖于工件大小9的定性评估, 或者只关注二维工件大小, 仅覆盖种植工件的一个切片10,11。此外, 通常使用手动分割方法, 这不仅费时费力, 而且容易产生内部和读者之间的差异11。最后, 协议通常不允许在12的同时测试非 fat 饱和和饱和脂肪的序列。然而, 这是可取的, 因为应用脂肪抑制技术深刻影响工件的大小。
在这里, 我们提出一个协议, 它允许可靠的, 半自动的, 基于阈值的, 三维量化的信号丢失和堆积工件的整个植入物, 或所有切片包含可见植入物工件。此外, 它允许测试 T1 和 T2-weighted 图像有或不含脂肪饱和度。该协议可用于评估不同植入物的 MRI 适宜性, 或不同脉冲序列对特定种植体金属工件的易损性。

<table border="0" cellpadding="0" cellspacing="0" width="638">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Aqua B. Braun Ecotainer</td>
			<td style="width:288px;">B. Braun Melsungen AG, Melsungen, Germany</td>
			<td style="width:136px;"></td>
			<td style="width:64px;"></td>
		</tr>
		<tr height="33">
			<td height="33" style="height:33px;width:151px;">Semisynthetic fat: Witepsol W25</td>
			<td style="width:288px;">Caelo Caesar &#38; Loretz GmbH, Hilder, Germany</td>
			<td style="width:136px;">4051</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Macrogol-8-stearate</td>
			<td style="width:288px;">Caelo Caesar &#38; Loretz GmbH, Hilder, Germany</td>
			<td style="width:136px;">3023</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Plastic box: not specified</td>
			<td style="width:288px;"></td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Implants: Nobel Replace</td>
			<td>Nobel Biocare, Z&#252;rich, Switzerland</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Water bath Haake S5P</td>
			<td style="width:288px;">Thermo Scientific, Waltham, MA, USA</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:151px;">Measuring cylinder Blaubrand Eterna, Class A, Boro 3.3</td>
			<td style="width:288px;">BRAND GmbH + Co Kg, Wertheim, Germany</td>
			<td style="width:136px;">32708</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">Coil: Variety</td>
			<td style="width:288px;">Noras MRI products GmbH, H&#246;chberg, Germany</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:151px;">MRI: Magnetom Trio</td>
			<td style="width:288px;">Siemens Healthcare GmbH, Erlangen, Germany</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:151px;">Postprocesing software: Amira 6.4</td>
			<td style="width:288px;">Thermo Scientific, Waltham, MA, USA</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
	</tbody>
</table>

protocol for the evaluation of mri artifacts caused by metal implants to assess the suitability of implants and the vulnerability of pulse sequences

随着磁共振成像 (mri) 扫描仪和医用植入物的数量不断增加, 放射科医生在 MRI 中越来越多地遇到与金属植入相关的工件, 从而降低了图像质量。因此, 植入物体积的 MRI 适配性以及脉冲序列的发展对减少图像工件的作用越来越重要。在这里, 我们提出了一个全面的协议, 允许对植入物体积的 MRI 的标准化评估。此外, 该协议还可用于分析不同脉冲序列对工件的易损性。所提出的协议可以应用于 T1 和 T2-weighted 图像, 有或不含脂肪抑制和所有被动植入物。此外, 该程序还实现了信号丢失和堆积工件的分离和三维识别。由于以往的调查在评价方法上差异很大, 结果的可比性有限。因此, 必须对 MRI 工件体积进行标准化测量, 以提供更好的可比性。这可能会改善植入物 MRI 的适用性和更好的脉搏序列, 以最终改善病人的护理。

通过上述协议, 我们评估了2种不同牙种植体的工件体积 (T; 参见材料表) 支持不同的冠 [瓷熔化对金属非贵金属合金 (CCT t) 和整体氧化锆 (Z T);图 1b和1c]。CCT T 样品代表高度顺磁性材料组分预测大文物 (钴 61%, 铬21% 和钨 11%;CCT)。Z T 样品的冠材料代表低顺磁性材料 (氧化锆 92%;Z). 此外, 评估了四种不同的、非脂肪饱和的 T2-weighted ?...

Watch this Scientific Journal Video about Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences at JoVE.c

Protocol for the Evaluation of MRI Artifacts Caused by Metal Implants to Assess the Suitability of Implants and the Vulnerability of Pulse Sequences

我们描述了一种标准化的方法来评估植入物引起的磁共振成像工件, 以估计植入物对磁共振成像的适用性和/或不同脉冲序列对金属工件的易损性。同时。

评估植入物所引起的 MRI 伪影和脉冲序列易损性评估的协议

As the number of magnetic resonance imaging (MRI) scanners and patients with medical implants is constantly growing, radiologists increasingly encounter ...

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