发明名称 |
Over-range image artifact reduction in tomographic imaging. |
摘要 |
<p>An apparatus for reducing image artifacts caused by over-ranging or clipping of the data collected in a tomographic scan fits a geometric model to the in-range data of each projection. The geometric model is sized to the in-range data by summing all of the data of the projection to obtain a value of the total slice volume. This geometric model is used to compute the slope of the over-range data from the last point of in-range data and this extrapolated data is substituted for the over-range data. The correction process is implemented in pipeline form by convolving an over-range mask indicating which data is in-range and which data is over-range with a box car convolution kernel which produces a trapezoidal correction mask. This correction mask, multiplied by the uncorrected projection data provides the appropriate slope to its clipped portions. <IMAGE></p> |
申请公布号 |
EP0544507(A2) |
申请公布日期 |
1993.06.02 |
申请号 |
EP19920310750 |
申请日期 |
1992.11.25 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
HSIEH, JIANG;KING, KEVIN FRANKLIN;BRAYMER, WILLAIM KEITH;KOSINSKI, PATRICK DANIEL |
分类号 |
A61B6/03;G06T5/20;G06T11/00;(IPC1-7):G06F15/62 |
主分类号 |
A61B6/03 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|