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SPECIFIC ABSORPTION RATE MODULATED BY SPATIAL PROXIMITY TO PATIENT
SPECIFIC ABSORPTION RATE MODULATED BY SPATIAL PROXIMITY TO PATIENT
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机译:病人对空间的接近程度调节特定的吸收率
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摘要
FIELD: medicine.;SUBSTANCE: group of inventions relates to medical equipment, specifically to means for magnetic resonance imaging. Method of operation of a magnetic resonance imaging system based on adjustment of a radio-frequency excitation field B1, applied to analyzed subject to be tomographed, comprises steps of determining at least one position parameter (d), which indicates the position of at least a portion of the analyzed subject with respect to at least one radio frequency transmitting antenna of the magnetic resonance imaging system and is carried out by using proximity detection unit, which includes at least two proximity sensors (D1, D9), determination by means of two proximity sensors (D1, D9) of at least one transverse dimension (wi) of the analyzed subject for a plurality of locations (zi) of at least part of analyzed subject, obtaining data for generating a geometric outline of the analyzed subject with respect to said at least one radio frequency transmitting antenna of the magnetic resonance imaging system from parameters (di) position and transverse dimensions (wi) defined on said plurality of locations (zi), adjustment of at least one radio-frequency power parameter of radio-frequency signal power, to be transmitted to said at least one radio frequency transmitting antenna, depending on at least one of the determined at least one position (d) position and the determined geometric size (w) of the analyzed subject. Magnetic resonance imaging system is configured to obtain magnetic resonance images of at least part of the analyzed subject and comprises a scanning unit providing a test space for accommodating at least a portion of the analyzed subject, wherein the test space has an input region for the analyzed subject to enter the examination space, and the scanning unit further has a main magnet configured to generate a static magnetic field B0 in the surveyed space, a magnetic field gradient coil system configured to generate gradient magnetic fields, superimposed on static magnetic field B0, at least one radio frequency transmitting antenna, which is configured to apply a radio-frequency excitation field B1 to nuclei of analyzed subject or nuclei inside part of investigated subject for magnetic resonance excitation, at least one radio-frequency receiving antenna which is configured to receive magnetic resonance signals from nuclei of the analyzed subject or nuclei within a portion of the analyzed subject which have been excited by applying a radio-frequency excitation field B1, control unit configured to control functions of the magnetic resonance imaging system, and proximity detection unit, including at least one proximity sensor (D), which is configured to determine at least one position parameter (d), which indicates position of at least part of analyzed subject in relation to said at least one radio-frequency transmitting antenna, wherein the control unit is configured to perform the method steps.;EFFECT: use of inventions makes it easier to monitor and verify the position of the analyzed subject.;8 cl, 5 dwg
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机译:发明领域本发明涉及医疗设备,尤其涉及用于磁共振成像的装置。基于调整到要进行断层摄影的被分析对象的射频激励场B 1 Sub>的调整,磁共振成像系统的操作方法包括确定至少一个位置参数(d)的步骤,指示至少一部分被分析对象相对于磁共振成像系统的至少一个射频发射天线的位置,并且通过使用包括至少两个接近传感器(D 1 Sub>,D 9 Sub>),通过两个接近传感器(D 1 Sub>,D 9 Sub>)确定至少一个至少部分分析对象的多个位置(z i Sub>)的分析对象的横向尺寸(w i Sub>),获得用于生成对象的几何轮廓的数据根据参数对磁共振成像系统的所述至少一个射频发射天线分析对象在所述多个位置(z i Sub>)上定义的s(d i Sub>)位置和横向尺寸(w i Sub>),至少调整一个射频信号功率的射频功率参数,取决于确定的至少一个位置(d)位置和确定的几何尺寸(w)中的至少一个,发送到所述至少一个射频发射天线被分析的主题。磁共振成像系统被配置为获得至少一部分被分析对象的磁共振图像,并且包括扫描单元,该扫描单元提供用于容纳至少一部分被分析对象的测试空间,其中该测试空间具有用于被分析对象的输入区域。被检体进入检查空间,并且扫描单元还具有被配置为在被调查空间中产生静磁场B 0 Sub>的主磁体,被配置为产生梯度磁场的磁场梯度线圈系统,至少一个射频发射天线叠加在静磁场B 0 Sub>上,该天线被配置为将射频激励场B 1 Sub>应用于被分析对象或原子核在用于磁共振激发的被测对象的内部,至少一个射频接收天线,其配置为从被分析对象的核或核中接收磁共振信号在通过施加射频激励场B 1 Sub>而被激励的被分析对象的一部分中,被配置为控制磁共振成像系统的功能的控制单元和接近检测单元,包括至少一个接近传感器(D),其被配置为确定至少一个位置参数(d),该位置参数指示被分析对象的至少一部分相对于所述至少一个射频发射天线的位置,其中,控制单元为效果:使用发明使监视和验证被分析对象的位置更加容易。8cl,5 dwg
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