Phantomlab ECTphan 330

The ECTphan Phantom is a cylindrical, liquid filled container with a variety of tests for quality monitoring of single photon emission tomography (SPECT) systems .

Test-Summary

The ECTphan™ phantom consists of three main test areas: the test plate, a uniformity area and the end plate for inserts.

• Test Plate
  – Pixel Size
  – Slice Width
  – Spatial Resolution

• Uniformity Section
  – Integral Uniformity
  – Noise Statistics

• End Plate
  – Low Contrast Measurements (‘Hot’ or ‘Cold’)
  – PSF
  – MTF
  – Center of Rotation.

Phantom Components

Test Plate: The test plate has 4 ‘hot’ holes spaced 120mm apart for measuring pixel size in X and Y axes. Four bar patterns up to 2.5lp/cm are available for visual evaluation of spatial resolution. Two opposed angled ramps provide the ability to measure slice thickness.

Uniformity Section: The uniformity section provides a 20cm diameter area that can be visually examined for artifacts and non-uniformities. The integral non-uniformity and RMS noise statistics can be calculated from the pixel values in the area.

End Plate: The end plate has threaded holes to mount the point source holder and the ‘hot’ and ‘cold’ low contrast inserts. When tests are not needed the holes may be plugged with SMR 168 plugs.

The point source holder can be positioned and imaged at the phantom center. The holder is designed for imaging the point sources in air and with scatter. From the reconstructed point source data, a point spread function (PSF) is generated and the full width at half maximum (FWHM) and full width at tenth maximum (FWTM) values can be measured. The modulation transfer function (MTF) may be generated from the PSF if software is available.

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