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1. 发明授权

US4554633A Sampled data CT system including analog filter and compensating digital filter 失效
标题翻译：采样数据CT系统包括模拟滤波器和补偿数字滤波器
公开(公告)号：US4554633A
公开(公告)日：1985-11-19
申请号：US428771
申请日：1982-09-30
申请人： Gary H. Glover , Dennis G. DallaPiazza , Norbert J. Pelc
发明人： Gary H. Glover , Dennis G. DallaPiazza , Norbert J. Pelc
IPC分类号： G06T11/00 , G06F15/42 , G01T1/17
CPC分类号： G06T11/005 , Y10S378/901
摘要： A CT scanner in which the amount of x-ray information acquired per unit time is substantially increased by using a continuous-on x-ray source and a sampled data system with the detector. An analog filter is used in the sampling system for band limiting the detector signal below the highest frequency of interest, but is a practically realizable filter and is therefore non-ideal. A digital filter is applied to the detector data after digitization to compensate for the characteristics of the analog filter, and to provide an overall filter characteristic more nearly like the ideal.
摘要翻译：其中通过使用连续的x射线源和采样的数据系统与检测器相比，每单位时间获取的X射线信息量大幅增加的CT扫描器。在采样系统中使用模拟滤波器将检测器信号的频带限制在感兴趣的最高频率之下，但是实际上是可实现的滤波器，因此是非理想的。数字滤波器在数字化后应用于检测器数据，以补偿模拟滤波器的特性，并提供更接近于理想的整体滤波器特性。

2. 发明授权

US5525906A Detection and elimination of wide bandwidth noise in MRI signals 失效
标题翻译：检测和消除MRI信号中宽带宽噪声
公开(公告)号：US5525906A
公开(公告)日：1996-06-11
申请号：US273577
申请日：1994-07-11
申请人： Carl R. Crawford , Matthew G. Eash , Steven P. Souza , Norbert J. Pelc , Dennis G. DallaPiazza , Daniel S. Small , Robert S. Stormont
发明人： Carl R. Crawford , Matthew G. Eash , Steven P. Souza , Norbert J. Pelc , Dennis G. DallaPiazza , Daniel S. Small , Robert S. Stormont
IPC分类号： G01R33/32 , A61B5/055 , G01R33/36 , G01R33/56 , G01R33/28
CPC分类号： G01R33/3621 , G01R33/5608
摘要： An MRI system includes a noise filter which receives each acquired NMR signal during a scan and detects short-duration noise pulses by sensing the signal level in a band of frequencies outside the imaging bandwidth. A blanking circuit suppresses the NMR signal during the time interval each noise pulse is detected to remove the noise pulse prior to image reconstruction.
摘要翻译： MRI系统包括噪声滤波器，其在扫描期间接收每个获取的NMR信号，并且通过感测成像带宽以外的频带中的信号电平来检测短持续时间的噪声脉冲。消隐电路在时间间隔期间抑制NMR信号，每个噪声脉冲被检测以去除图像重建之前的噪声脉冲。

3. 发明授权

US4393402A Subtraction fluoroscopy method and apparatus 失效
标题翻译：减除荧光透视法和装置
公开(公告)号：US4393402A
公开(公告)日：1983-07-12
申请号：US271314
申请日：1981-06-08
申请人： Gary S. Keyes , Jean-Pierre J. Georges , Dennis G. DallaPiazza
发明人： Gary S. Keyes , Jean-Pierre J. Georges , Dennis G. DallaPiazza
IPC分类号： A61B6/00 , H04N5/32 , H04N7/18
CPC分类号： H04N5/3205
摘要： Image frames produced consecutively with x-ray beams having different spectral bands or average energy levels are converted to analog video signals and then to digital data. The digital data for an image at one energy is stored in a memory and the ensuing data for the next image is subtracted from the stored data in an alternate or cyclic fashion. The resulting difference data is converted to analog video signals and displayed on a television monitor at standard frame rates. The same system can be used to store a digitized data mask frame and the digital data for ensuing frames can be subtracted from the mask. In some embodiments a buffer is used to allow removal of data from memory without having the data from a preceding frame overwritten by ensuing frames. Other embodiments use more than one memory and, in some cases, buffers to allow manipulating the data so snapshot, integrated and continuous or real-time subtraction images can be displayed individually on a single monitor or jointly on additional monitors.
摘要翻译：与具有不同光谱带或平均能级的X射线束连续生产的图像帧被转换为模拟视频信号，然后转换为数字数据。一个能量的图像的数字数据被存储在存储器中，并且以交替或循环方式从存储的数据中减去下一个图像的后续数据。所得到的差分数据被转换为模拟视频信号，并以标准帧速率显示在电视监视器上。可以使用相同的系统来存储数字化数据屏蔽帧，并且可以从掩码中减去随后的帧的数字数据。在一些实施例中，使用缓冲器来允许从存储器中移除数据，而不需要由随后的帧覆盖的前一帧的数据。其他实施例使用多于一个存储器，并且在一些情况下使用缓冲器来允许操纵数据，因此快照，集成和连续或实时减法图像可以单独显示在单个监视器上或联合地显示在附加监视器上。

4. 发明授权

US4188536A Dental x-ray apparatus 失效
标题翻译：牙科X光装置
公开(公告)号：US4188536A
公开(公告)日：1980-02-12
申请号：US874778
申请日：1978-02-03
申请人： Dennis G. DallaPiazza
发明人： Dennis G. DallaPiazza
IPC分类号： H05G1/46
CPC分类号： H05G1/46
摘要： In dental x-ray apparatus a control is provided for driving the high voltage transformer in the tube head at a frequency far above power line frequency. The transformer is driven with an inverter. A precision d-c voltage regulator that operates in an "add-on" mode and thus only handles a portion of the output current controls the voltage supplied to the inverter. The d-c voltage regulator is supplied a voltage by a transformerless a-c/d-c converter whose output is proportional to the 60 Hz power line voltage that supplies it. The x-ray tube filament transformer is also driven at a frequency above power line frequency. Means are provided to cut off power to the x-ray tube if its current does not reach a certain value within a short time after an exposure is initiated. Means are provided for isolating high voltage power circuits from low voltage control circuits.
摘要翻译：在牙科X射线设备中，提供了一种用于以远远高于电源线频率的频率驱动管头中的高压变压器的控制。变压器由变频器驱动。精密d-c电压调节器以“附加”模式工作，因此只能处理一部分输出电流来控制提供给变频器的电压。 d-c电压调节器由无变压器a-c / d-c转换器提供电压，其输出与提供它的60 Hz电源线电压成比例。 X射线管灯丝变压器也以高于电源线频率的频率驱动。提供装置，用于在曝光开始后的短时间内其电流未达到一定值时切断对X射线管的电源。提供了用于将高压电力电路与低压控制电路隔离的装置。

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