The leaf gap is a break in the vascular tissue of a stem above the point of attachment of a leaf trace. [1] It exists in the nodal region of the stem as a "gap in the continuity of the primary vascular cylinder above the level where a leaf trace diverges toward a leaf. This gap is filled with parenchyma tissue". [2]

叶隙 leaf gap 高等植物由茎生长出叶片时，在叶的维管束从茎的维管束向外分出后，在茎的维管束上还留有维管束痕迹称为叶隙。 可是在放射 中柱 中，由于不能生成叶隙，所以在区分抱树莲纲与石松纲时是受到特别重视。

2018年11月13日 · The dosimetric leaf gap (DLG) and multileaf collimator (MLC) transmission are two important systematic parameters used to model the rounded MLC leaf ends effect when commissioning an Eclipse treatment planning system (TPS). Determining the optimal DLG is a time consuming process.

英文: Leaf gap (lacuna) A region of parenchyma differentiated in the stem vascular cylinder immediately above a diverging LEAF TRACE. Lateral connections insure no break in the vascular system.

…toward the leaf is a leaf gap, called a lacuna. The number of lacunae varies among angiosperm groups and remains a characteristic for classifying the various species. …with parenchyma cells known as leaf gaps.

Nodal Anatomy in Leaf Traces and Leaf Gaps: A shoot bears nodes’ and internodes. At each node, portions of the vascular system are deflected into the leaf, which is attached at this node. A vascular bundle located in the stem but directly related to a leaf, to represent the lower part of the vascular supply of this leaf, is termed the leaf trace.

2018年1月1日 · Dosimetric leaf gap (DLG) is a parameter to model the round-leaf-end effect of multi-leaf collimators (MLC) that is important for treatment planning dose calculations in radiotherapy. In this study we investigated on the relationship between the DLG values and the dose calculation errors for a high-definition MLC.

Purpose: To investigate (i) the dosimetric leaf gap (DLG) and the effect of the "trailing distance" between leaves from different multileaf collimator (MLC) layers in Halcyon systems and (ii) the ability of the currently available treatment planning systems (TPSs) to approximate this effect.

2022年6月12日 · 叶面积指数（leaf area index）又叫叶面积系数，是一块地上阳光直射时作物叶片垂直投影的总面积与占地面积的比值。 即：叶面积指数=投影总面积/占地面积。

2015年7月8日 · For the Eclipse treatment planning system (TPS) with rounded leaf-end multileaf collimator (MLC), one practical way to improve the agreement of planned and delivered doses is to tune the value of dosimetric leaf gap (DLG) in the TPS from the measured DLG.