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TO CTDI plus

by | Nov 3, 2016 | Leeds CT

TO CTDI plus permits the user to measure the dose index for computed tomography systems. The test object consists of three PMMA cylinders, one cylinder represents the paediatric head (100mm diameter), the second the adult head (160mm diameter) and the other represents the body (320mm diameter). The length of each cylinder is 140mm. Each cylinder contains holes large enough to accept a radiation detector, used to take the dose measurements.

There is a hole at the centre of the cylinders and one at each 90° interval, centred 10mm from the edge of the cylinder. This item is available as a nested phantom (the paediatric head phantom fits inside the adult head phantom which fits inside the body phantom).

TO CTDI plus enables the following tests to be made:

  • CTDI100 (centre)
  • CTDI100 (peripheral)
  • CTDIw (weighted CTDI100)
  • CTDIvol (weighted CTDIw)
  • CTDIfree air

TO CTDI plus is heavy and as such is provided in a tough case with wheels and telescopic handle.

Please note: a CTDI holder is now available for suspension of the TO CTDI plus over the couch end.

CBCT-161

by | Nov 3, 2016 | Leeds Dental

CBCT-161 phantom is used for constancy testing of CBCT systems.

CBCT-161 comprises:

  • PMMA cylinder with;160 mm diameter, 40 mm length
  • Spirit level and pigment-filled centre markings for easy and reproducible positioning
  • Tripod for universal positioning
  • Soft tissue equivalent; PMMA
  • Bone equivalent; PVC- density 1.30 – 1.45 g/cm
  • Air gap

CBCT-161 permits measurement of the following image quality parameters:

  • Pixel Intensity Value Linearity
  • Noise
  • CNR
  • Homogeneity
  • Artefacts
  • MTF

 

CBCT-161-A phantom is an accessory to CBCT-161 and is used for acceptance testing of CBCT systems.

CBCT-161-A comprises:

  • PMMA cylinder with;160 mm diameter, 60 mm length
  • PMMA cylinder with;160 mm diameter, 50 mm length, with threaded hole for attachment to a tripod

TOR CDR

by | Nov 3, 2016 | Leeds CR-DR

TOR CDR radiography phantom is a routine test object designed to be used quickly and easily on a regular basis (e.g. weekly or monthly) to provide an ongoing check of imaging performance, particularly those aspects which are most liable to deterioration. After an initial grey-scale check, image quality is measured simply by counting the number of details detected and the number of bar-patterns resolved in the image. An ongoing record of these numbers will reveal any trend towards deterioration in imaging performance.

Used for conventional and non-subtractive digital radiography, and fluorography, enables the following checks to be made:

  • Sensitometric measurements (10 test point details, 5.6mm diameter)
  • Resolution limit (0.5 to 14.3 LP/mm)
  • Low-contrast large-detail detectability (17 details, 11mm diameter)
  • High-contrast small-detail detectability (17 details, 0.5mm diameter)

In addition to checking the consistency of radiographic performance, the test object can be used to assess the relative performance of different screen-film combinations.

SedentexCT IQ

by | Nov 2, 2016 | Leeds CT

SedentexCTIQ consists of a PMMA cylinder (160 mm diameter) with recesses to house test inserts (fig. 1). Within the body of the cylinder are features for the following tests:

  • Noise/Uniformity
    The lower section of the phantom is uniform PMMA (density 1.20 +/- 1.00%)
  • Geometric Distortion
    An array of 2.0 mm diameter, 3.0 mm deep Air gaps are uniformally pitched at 10.0mm intervals through one slice of the cylinder

Test Inserts are included to perform the following measurements:

  • Spatial Resolution
    • Line Spread Function (LSF) – PMMA/PTFE interface (fig. 2)
    • Point Spread Function (PSF) – 0.25mm diameter stainless steel wire suspended in air (fig. 3)
    • LP/mm – alternating Aluminium/polymer (XY)
      (1.0, 1.7, 2.0, 2.5, 2.8, 4.0 and 5.0 LP/mm) (fig. 4)
    • LP/mm – alternating Aluminium/polymer (Z)
      (1.0, 1.7, 2.0, 2.5, 2.8, 4.0 and 5.0 LP/mm) (fig. 5)
  • Contrast Resolution (fig. 6)
    1.0, 2.0, 3.0, 4.0, 5.0 mm diameter Al, PTFE, Delrin, LDPE and Air rods suspended in PMMA
  • Pixel intensity (fig. 7)
    10.0 mm diameter Al, PTFE, Delrin, LDPE and Air rods suspended in PMMA
  • Beam Hardening Artefacts (fig. 8)
    A line of three 5.0 mm diameter rods of Ti suspended in PMMA
  • Blank PMMA insert (fig. 9)
  • Automatic Scoring Software (available separately)
    See Radia software for more details
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