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Table 1 Hounsfield Units measurements of air gaps between boluses and RANDO® phantom external surface

From: Improving 3D-printing of megavoltage X-rays radiotherapy bolus with surface-scanner

MATERIALS Mean HU Standard deviation HU Maximum Gap Depth HU Maximum Gap Depth (mm)
BolusCT
 Clear Resin − 295 58 − 627 1–2
 Digital ABS − 387 148 − 590 1–2
 PLA − 390 102 − 591 1–2
 All − 383 134 −627 1–2
BolusS
 Clear Resin − 45 51 − 167 < 0.6
 ABS − 191 54 − 313 < 0.6
 PLA − 155 77 − 294 < 0.6
 All − 130 87 −313 < 0.6
BolusW
 Wax −469 219 − 860 2–3