在可看见区域内容的显示模式中，也可看见区域背景影像。

The background image for a zone is visible in all display modes in which a zone's contents are visible.

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背景：真性、假性腰椎滑脱时的影像学表现有许多不同之处，CT能显示小关节的形态学变化，具有普通X射线平片没有的优势。

BACKGROUND: Isthemic and degenerative lumbar spondylolisthesis exhibit different images. CT can display morphological changes of facet joint, which is superior over X-ray films.

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