楼氏电容推出无磁电容器用于MRI扫描仪,可防止图像失真并最大限度减少图像校正的需要
医疗保健专业人员和患者依靠磁共振成像(MRI)技术来检查身体的软组织和器官,以非侵入性的方式检测从变性疾病到肿瘤等各类问题。检测时,MRI机器使用强磁场和计算机生成的无线电波来获取横截面图像。因此,MRI的质量取决于磁场的均匀性——这意味着即使是MRI扫描仪内最小的磁迹也会破坏磁场并降低MRI图像的质量。可见,选择正确的元件对于保证成像质量至关重要。
一、MRI工作原理简述
常见的MRI仪器是基于核磁共振(NMR)的原理。更具体地说,构成人体的分子含有氢,而氢的原子核中有一个质子,它就像一块具有北极和南极的磁体。氢原子置于磁场中时,它们的自旋(亚原子粒子的特性)会均匀排列。当患者被放置在MRI扫描仪管内时,身体分子中的质子以同一方向自旋排列,就如同在足球场上练习的军乐队。
当计算机生成的短射频信号被施加到该均匀场时,这些质子会受到“轻推”而打破队形,就像整齐的军乐队中乱入了一只“不速之球”;信号停止发射后,质子又回归到它们的对齐状态。在重新排列的过程中,能量被释放出来。该能量可以被测量并用于区分不同类型的分子及其位置。
二、磁场均匀性极大影响磁共振成像(MRI)质量
然而,磁场中即使最轻微的变化也会导致质子排列的变化,这意味着它们对刺激的反应也时常不尽相同,而这些差异会扰乱检测算法。医疗实践中,这些不规则的检测、过度的信号噪声或信号强度的随机变化会产生颗粒状图像,而该低质量的图像可能会导致医生做出错误的诊断,从而给出错误的治疗方案。
三、正确选择元件材料对于规避磁场波动至关重要
MRI扫描仪内的磁性元件会改变磁场的均匀性,即使是最微小的磁迹也会影响MRI图像的质量。因此医疗设备制造商在采购所需的如固定电容器、可调电容器、电感器和连接器等元件时,必须选用那些由不呈现可测量磁性的高纯度金属制造而成的元件。
符合以上特性要求的元件需具备严格的可追溯性、严密的测试方案以及扎实的专业材料科学体系。例如,许多电容器设有镍阻挡层来提供可焊性,然而,镍的磁性使电容器无法用于成像应用;同样,另一种常用材料——商业黄铜,也不能用于这类应用。
四、高质量的无磁电容器
鉴于MRI仪器应用严格的无磁要求,楼氏电容(KNOWLES)仅使用不表现出可测量磁性的高纯度金属,例如Knowles生产带有银/钯 (Ag/Pd) 端头的无磁电容器,并且可根据客户要求,定制任何所需的无磁硬件。Knowles的无磁系列产品具备诸多优势,如:
· 不含铅,避免了焊接温度升高和浸出问题;
· 具有严密的可追溯性和严格的测试制度,以确保真正满足无磁这一基本参数要求。
楼氏电容的无磁系列产品采用无磁端头,以精选的无磁性C0G、高Q和X7R电介质制造而成。这种对元件制造的严格把控可防止MRI应用的图像失真并最大限度地减少图像校正的需要,因此,临床医生无需进行更多侵入性手术便可对患者作出可靠的诊断。
Knowles Precision Devices 提供的无磁电容器样本
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本文由观海听澜转载自Knowles,原文标题为:楼氏电容|医学成像质量始于正确元件选择——磁共振成像(MRI),本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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Capacitance Tolerance(%、pF)
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Dielectric Classification
|
0603J0500120JAB
|
Multilayer Ceramic Chip Capacitor
|
0603
|
Nickel barrier
|
50Vdc
|
12pF
|
±5%
|
C0G/NP0(1B) to AEC-Q200
|
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风力发电领域的现有趋势(上)
在本篇文章中,Knowles将深入探讨一系列风力发电领域关键的现有发展趋势,这些趋势不仅推动了发电能力的全面提升,也引领了电力电子设备技术的创新和转型。Knowles将重点关注这些前沿动态,揭示它们如何共同塑造未来风力发电系统的新面貌,以及为电力电子行业带来的新机遇和挑战。
行业资讯 发布时间 : 2024-09-14
电子商城
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥0.5903
现货: 8,050
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor,
价格:¥2.3847
现货: 3,000
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥3.1658
现货: 2,500
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:
现货: 2,500
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥2.1151
现货: 1,600
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥3.6577
现货: 500
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥5.1648
现货: 500
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥3.0556
现货: 380
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥4.9189
现货: 300
品牌:KNOWLES
品类:Multilayer Ceramic Chip Capacitor
价格:¥4.9189
现货: 250
服务
整体外形尺寸小至0.6*0.3*0.3mm (DFN0603),工作电压范围覆盖2.5V~36V,电容值低至0.2pF,浪涌能力最高可达240安培,静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
提交需求>
可定制电线特性阻抗50-80Ω,静电容量54-110pF/m,减衰量0.5-0.7db/m以下,芯对数和截面积、尺寸长度;支持B超电线、内窥镜电线、血液分析仪电线、医疗USB电线、病床设备电线定制。
最小起订量: 1000m 提交需求>
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