Micro-CT Bar Pattern Phantoms

For the determination of in-plane and axial spatial resolution

Evaluate axial and sagittal spatial resolution in preclinical and industrial micro-CT
Provides high resolution contrast
Bar and point structures down to 5 microns (air, QRM-70113 and resin, QRM-70114) or to 1 micron (NANO, QRM-70119)
Corresponds to 3.3 to 100 lp /mm (air, QRM-70113 and resin, QRM-70114) or 500 to 50 lp/mm (NANO, QRM-70119)

The Micro-CT Bar Pattern Phantoms are used to assess the spatial resolution in micro-CT in a direct visual manner. The phantoms offer an alternative to indirect methods for the evaluation of spatial resolution in high-resolution X-ray imaging modalities.

The phantoms contain of two chips, one orientated axial and one oriented in perpendicular (sagittal) to it. The chips are mounted on a slim support in air (QRM-70113, QRM-70119) or embedded within a resin cylinder (QRM-70114). The optimized arrangement of the different bar and point structures allows for the evaluation of spatial resolution in the center as well as in the periphery of the image in one single measurement.

QRM-70113, QRM-70114: The 5 mm x 5 mm chips contain bar and point patterns ranging from 5 to 150 microns (i.e. 100 to 3.3 lp / mm). The depth of the structures varies between 70 and 150 microns.

QRM-70119: The 3 mm x 3 mm chips contain bar and point patterns ranging from 1 to 10 microns (i.e. 500 to 50 lp / mm). The depth of the structures varies between 5 and 15 microns. In addition, a slanted edge and a so-called Siemens-star (actinomorphic star) are placed on the chip.

Other dimensions of housing are available upon request.

Micro-CT Bar Pattern Air, QRM-70113
Micro-CT Bar Pattern Resin, QRM-70114
Micro-CT Bar Pattern NANO, QRM-70119

Technical Specifications

Micro-CT Bar Pattern Phantom, air
Phantom diameter:	20 mm
Phantom height:	40 mm
Phantom wall thickness:	0.2 mm
Phantom material:	air / plastic
Contrast of pattern:	silicon / air

Micro-CT Bar Pattern Phantom, resin
Phantom diameter:	8 mm
Phantom height:	40 mm
Phantom material:	resin
Contrast of pattern:	silicon / resin

Chip dimension:	5 mm x 5 mm
Chip height:	0.66 mm
Chip material:	Silicon
Range of the bar and point structures on the chip (width):	5 - 150 microns (see Table 1, Table 2)
Range of the bar and point structures on the chip (depth):	70 - 150 microns
Resolution:	100 to 3.3 lp/mm (see Table 1)

Table 1:
linewidth (microns)	linepairs / mm
5	100
10	50
15	33.3
20	25
25	20
30	16.7
50	10
100	5
150	3.3

Table 2:number of lines and dots per section
section	line width (µm)	lines per pattern	dots (µm)	dots per pattern
A	5, 10, 25, 50, 100, 150	5	-	-
B	5, 10, 15, 20, 25, 30	5	5, 10, 15, 20, 25, 30	18
C	5, 10, 15, 20, 25, 30	5	5, 10, 15, 20, 25, 30	18
D	-		5, 10, 25, 50, 100, 150	18
E	5, 10, 25, 50, 100, 150	5	-	-

Phantom diameter:	5.4 mm
Phantom height:	19 mm
Phantom wall thickness:	0.2 mm
Phantom material:	air / plastic

Chip dimension:	3 mm x 3 mm
Chip material:	silicon
Chip height:	0.66 mm
Contrast of pattern:	silicon / air
Range of the bar and point structures on the chip (width):	1 - 10 microns (see Tables 1-4)
Range of the bar and point structures on the chip (depth):	5 - 15 microns
Resolution:	500 to 50 lp /mm (see Table 1)

Table 1:
line/widths (microns)	linepairs / mm
1	500
2	250
3	166.4
4	125
5	100
6	83.3
7	83.3
8	71.4
9	55.5
10	50

Table 2: Sections and structures on the chip
section	description	pattern / resolution
1	center section providing several bar and point pattern	1 to 10 µm structures
2 a-d	corner sections providing several bar and point pattern in different orientation	1 to 5 µm structures
3	slanted edge section, 15° tilted edge for MTF	-
4	36 actinomorphic star - test pattern	going down from 17.5 µm to 1 µm
5	36 actinomorphic star - test pattern	going down from 17.5 µm to 1 µm
6	point grid point-to-point center distance 100 µm	10 to 2 µm points

Table 3: line and point pattern
row	line thickness (µm)	linepairs / mm	points (µm)
A	2, 4, 6, 8, 10	50 - 250	-
B	-	-	2, 4, 6, 8, 10
C	1, 2, 3, 4, 5	100 - 500	-
D	1, 2, 3, 4, 5	100 - 500	-
E	-	-	2, 4, 6, 8, 10
F	2, 4, 6, 8, 10	50 - 250	-

Table 4: line and point pattern
row	line thickness (µm)	linepairs / mm	points (µm)
A	10, 8, 6, 4, 2	50 - 250	-
B	10, 8, 6, 4, 2 (tilt 90°)	50 - 250	-
C	-	-	2, 4, 6, 8, 10
D	-	-	10, 8, 6, 4, 2
E	-	-	1, 2, 3, 4, 5 - 5, 4, 3, 2, 1
F	1, 2, 3, 4, 5 - 5, 4, 3, 2, 1	500 - 100	-
G	1, 2, 3, 4, 5 - 5, 4, 3, 2, 1 (tilt 90°)	500 - 100	-

Image Gallery

1 / 15

Micro-CT Bar Pattern Air, QRM-70113
Micro-CT Bar Pattern Resin, QRM-70114

2 / 15

Micro-CT Bar Pattern NANO, QRM-70119

3 / 15

3D rendering of Micro-CT Bar Pattern Air, QRM-70113 and Micro-CT Bar Pattern Resin, QRM-70114

4 / 15

Micro-CT Bar Pattern Air, QRM-70113 : Micro-CT scans in air (left) with 5.5 μm voxel size
Micro-CT Bar Pattern Resin, QRM-70114: Micro-CT scans in resin (right) with 40 μm voxel size