PET raw data (sinogram)

Example of sinogram

Scanners and file formats

ECAT HR+, produces ECAT 7.x format sinogram files (format is defined e.g. in ECAT Software Operating Instructions Version 7.2). Because of this and Imanet co-operation, ECAT 7.x format is supported by most computer programs; if a program does not yet support ECAT 7.x format, please contant the software team.

Currently most analysis programs can also read PET data in CTI ECAT 6.3 format, which is the format of the old PET scanner, ECAT 931. This scanner was put out of operation in the end of April 2005. During a long transitional stage the programs will be able to read both ECAT 6.3 and 7.x formats. Tools for conversion between ECAT formats are already available. ECAT 6.3 format for sinograms, normalization and attenuation files is defined in Siemens manual (Operating Instructions ECAT Scanner Software). To reconstruct the ECAT sinograms (*.scn) to images, also the attenuation (*.atn) and normalization (*.nrm) files are required!

2D raw data from GE Advance is automatically converted to CTI ECAT 6.3 format. 3D raw data from GE Advance can be read from the GE database (please ask Mika Teräs), but this data cannot yet be used by analysis programs. The GE Advance sinograms in ECAT format are already attenuation and normalization corrected, thus separate files for these purposes are not needed.

HRRT produces Interfile format sinograms, which can be converted to ECAT 7 format using if2ecat program (PC/Windows XP) provided by the scanner manufacturer.

PET data may contain patient names!

Note that images and sinograms in ECAT 6.3 or 7 format may contain the name of subject. Transfer of PET images or sinograms using any media outside PET Centre and University Hospital is strictly forbidden, unless names are first removed; see Patient privacy protection.

Working with raw data:

Retrieving information on ECAT files:

Converting ECAT files to binary flat files and back:

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