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磁共振成像时测量射频感应加热接近被动性植入物的标准试验方法  
 【英文标准名称】  Standard Test Method for Measurement of Radio Frequency Induced Heating Near Passive Implants During Magnetic Resonance Imaging
 【原文标准名称】  磁共振成像时测量射频感应加热接近被动性植入物的标准试验方法
 【标准号】  ASTM F2182-2009
 【标准状态】  Active
 【国别】  美国
 【发布日期】  2009
 【实施或试行日期】  
 【发布单位】  美国材料与试验协会(US-ASTM)
 【起草单位】  F04.15
 【标准类型】  (Test Method)
 【标准水平】  ()
 【中文主题词】  
 【英文主题词】  implant; MRI (magnetic resonance imaging); MR safety; RF (radio frequency) heating; MRI (magnetic resonance imaging); Passive implants; RF-induced temperature rise; RF (radio frequency) receivers; Specific absorption rate (SAR); Whole body magnetic res
 【摘要】  

This test method describes a test procedure for evaluating the RF-induced temperature rise associated with an MR procedure involving a specific frequency of RF irradiation of an implant. The heating measurements are made twice, once with the implant and then repeated at the same location without the implant. These two measurements estimate the local SAR and the local additional temperature rise with the implant.

If there is a significant temperature rise associated with the implant, the results may be used as an input to a computational model for estimating temperature rise in a patient. The combination of the test results and the computational model results may then be provided to regulatory bodies and physicians to assess the safety of a patient with the implant during an MR scan.

1.1 This test method covers measurement of radio frequency (RF) induced heating on or near a passive medical implant and its surroundings during magnetic resonance imaging (MRI).

1.2 This test method is one of those required to determine if the presence of a passive implant may cause injury to the patient with the implant during an MR procedure. Other safety issues that should be addressed include magnetically induced displacement force and torque.

1.3 The amount of RF-induced temperature rise for a given specific absorption rate (SAR) will depend on the RF frequency, which is dependent on the static magnetic field strength of the MR system. Because of possible additional heating, particularly when implant dimensions approaches or exceeds onequarter of the wavelength of the RF field inside the phantom, conclusions from measurements made at one static magnetic field strength do not apply to other field strengths and frequencies. While the focus in this test method is on 1.5 T or 3 Tesla cylindrical bore MR systems, the RF-induced temperature rise for an implant in open MR systems can be evaluated by suitable modification of the method described herein.

1.4 This test method assumes that testing is done on devices that will be entirely inside the body. For other implantation conditions (for example, external fixation devices, percutaneous needles, catheters or tethered devices such as ablation probes), modifications of this test method are necessary.

1.5 This test method applies to whole body magnetic resonance equipment, as defined in section 2.2.103 of the IEC Standard 60601-2-33, Ed. 2.0, with a whole body RF transmit coil as defined in section 2.2.100. The RF coil is assumed to have quadrature excitation.

1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

 【中国标准分类号】  C45
 【国际标准分类号】  11_040_40
 【页数】  12P.;A4
 【正文语种】  英语
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