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 For Research in 3D Dosimetry for Radiotherapy
Vista™ reconstructs a 3D map of optical attenuation coefficients within an object suspended in the scanner’s region of interest. This is done by capturing a series of 2D optical projections through the region of interest while the object is being rotated and then using Feldkamp-filtered back projection to construct the 3D map. The base system is designed to work with radiochromic dosimeters such as Fricke gels which have an absorption peak at 590 nm. Different wavelengths are available on request for different dosimeters and for different applications.
The Vista 10 model scans objects up to 10 cm diameter by 10 cm long, and the Vista 15 scans objects up to 15 cm diameter by 12 cm long. Objects are suspended in a liquid filled aquarium to provide index of refraction matching. Software is included for scanning, reconstruction and display. Data is fully accessible for research applications.
Vista Performance
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Typical Scanning Laser Systems |
VISTA 10 and 15 |
| Scanning time |
6 minutes per slice |
less than 5 minutes for 360 projections, up to 400 slices |
| Reconstruction time |
6 minutes per slice |
Less than 5 minutes for 100 slices |
| Spatial resolution |
0.5 mm, non isotropic |
2.0, 1.0, 0.5, 0.25 mm, isotropic |
Overall Time
to Results |
4 hours – 1 day or more |
Less than 1 hour |
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