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

Radiation Oncology

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

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

ISSN: 1748-717X