Table 1.

List of the parameters for image analysis and inserts

Parameter	Insert design	Position
Image homogeneity (image noise)	Uniform PMMA	The base part of the phantom
Image uniformity	Uniform PMMA	The base part of the phantom
Geometrical distortion	An array of 2.0 mm diameter, 3.0 mm deep air gaps are uniformly pitched	Between the uniform PMMA and the holes for inserts
Pixel intensity value	Five 25 mm diameter material discs (PTFE, Delrin, LDPE, aluminium, air) suspended in PMMA	Row 3
Contrast resolution	1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm and 5.0 mm diameter rods (PTFE, Delrin, LDPE, aluminium, air) suspended in PMMA	Row 3
Spatial resolution—line pair chart	Alternating aluminium/polymer chart (1.0 LP, 1.7 LP, 2.0 LP, 2.5 LP, 2.8 LP, 4.0 LP and 5.0 LP mm−1). Both xy and z directions	Row 4
Spatial resolution—PSF and MTF	PSF—0.25 mm diameter stainless steel wire suspended in air	Row 4
Spatial resolution—line spread function and MTF	Sharp edge of the PMMA/PTFE interface	Row 4
Metal artefact	A line of three 5.0 mm diameter Ti rods suspended in PMMA	Row 1

LDPE, low density polyethylene; MTF, modulation transfer function; PMMA, polymethyl methacrylate; PSF, point spread function; PTFE, polytetrafluoroethylene; Ti, titanium.

All holes other than those mentioned above were filled with the uniform PMMA inserts.