breast boards

breast boards

[′brest ‚bȯrdz]
(civil engineering)
Timber planks used to support the tunnel face when excavation is in loose soil.
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References in periodicals archive ?
3 Breast Boards and Head Supports for more exacting and comfortable patient positioning during radiation treatment.
Standard bore CT systems constrain patient positioning by limiting the use of positioning devices like inclined breast boards, because the bore and scan field-of-view cannot accommodate a patient positioned off-center.
Biograph mCT's large 78 cm bore can also help to alleviate patients' sense of claustrophobia and allows better positioning of RTP devices, such as breast boards, and makes scanning of obese patients easier.