philips slice timing option

最新推荐文章于 2025-06-11 13:26:56 发布

转载最新推荐文章于 2025-06-11 13:26:56 发布 · 727 阅读

本文介绍了Philips MRI扫描仪的六种切片定时选项，包括默认设置、升序、降序、中央、反向中央及交错扫描方式，并详细解释了每种方式的工作原理和应用场景。

Philips Slice Timing Options:
1) DEFAULT - Philips default slice timing correction for a single package scan is as follows: 1, 3, 5, 7... 2, 4, 6, 8. If it is a multipackage scan, the slices are first distributed over packages, then it proceeds with first off, then even slices. For example, in a two package scan, it would be 1, 5, 9...3, 7, 11 in the first package and 2, 6, 10.... 4, 8, 12 in the second one.
2) ASCENDING - Single package ascending order slices are as follows: 1, 2, 3, 4, 5... from anterior to posterior, from left to right, and from foot to head. For multiple packages, it would be slice 1, 3, 5, 7 in the first package and 2, 4, 6, 8 in the second.
3) DESCENDING - Single package descending order slices are as follows: ...5, 4, 3, 2, 1 from posterior to anterior, from right to left, and from head to foot. For multiple packages, it would be slice ...8, 6, 4, 2 in the first package and ...7, 5, 3, 1 in the second one.
4) CENTRAL - In central slice order, the middle slice is measured first, and then outwards in a ping pong type order, such as: 3, 4, 2, 5, 1 or 4, 3, 5, 2, 6, 1.
5) REVERSE CENTRAL - Opposite from central order, reverse central measures the outer slices first and ping pongs towards the middle slice, such as: 1, 5, 2, 4, 3 or 1, 6, 2, 5, 3, 4.
6) INTERLEAVED - An advantage of interleaved order is the minimization of spillover from neighboring slices, since the time spacing between any set of neighboring slices is always large. On our scanner, the interleave index is estimated by the square root of the number of slices in a volume, rounded to the next integer. For example, a 10 slice interleave estimates to 3.162 and rounds to 3, making the slice order: 1, 4, 7, 10, 2, 5, 8, 3, 6, 9. If you are unsure about the integer rounding, the slice order can be determined by running your protocol with the phantom, viewing the logging display, and determining the interval between the s values on each line.

from：http://dbic.dartmouth.edu/wiki/index.php/Slice_Acquisition_Order