Blood on-line sampler (ABSS) data

Arterial whole blood radioactivity concentration can be measured with an automatic blood sampling system (ABSS, on-line detector, "blood pump") to record the curve precisely after radiotracer bolus infusion.

It may be necessary to collect a few blood samples while the on-line sampler is still working. These may be needed for example for metabolite analysis or for determining the blood-to-plasma ratio. Usually these manual samples can be taken from the end of the ABSS tubing, so that they do not cause any disturbance in the on-line data.

On-line samplers

Currently, there are four systems installed in the Turku PET Centre, two made by Scanditronics/GEMS and two made by Allogg. Each on-line sampler is normally used only with a certain PET scanner, but they can be swapped if necessary.

ABSS systems have different calibration coefficients and file format, but these are normally automatically taken into account by the ABSS data processing software. Yet, there may be some differences in location of the data files, and even when processing of the data, especially in case of errors.

HR+

Raw on-line detector data of this Allogg ABSS (Allogg AB, Mariefred, Sweden, http://www.allogg.se/) is stored in a specific format; note that the format is not the same as the format of the second Allogg ABSS. After the necessary processing and correction steps, the data format is the same as in any other TAC files.

The raw blood data is written in the PETO system. From these directories the original data can be copied to group disks. Data that was collected before PETO system was available can be found in S:\Lab\plasma\archive\hrplus_kevat2004_2005\ or S:\Lab\plasma\HRplus\.

HRRT

Our second Allogg ABSS (Allogg AB, Mariefred, Sweden, http://www.allogg.se/) is used with HRRT scanner. It has also its own file format and calibration coefficients, but data can be processed with blo2kbq as usual. After the necessary processing and correction steps, the data format is the same as in any otherTAC files.

Before the second Allogg ABSS was installed, other ABSS systems have been used with HRRT.

GE-PET

The raw blood data is written in the PETO system. From these directories the original data can be copied to group disks.

GE Advance (put out of operation in the end of 2010)

On-line detector that is normally located at GE Advance PET scanner, is manufactured by GEMS. Raw on-line detector data is stored in a specific format. After the necessary processing and correction steps, the data format is the same as in any other TAC files.

The raw blood data is written in the PETO system. From these directories the original data can be copied to group disks.

Studies conducted before 2000-02-03

Blood data files from GE Advance studies which date back to 2000-02-02 and before that, do not contain the date of the study. The date has to be added manually to the data file in international format; without it, wrong calibration coefficients will be applied (the first measured calibration coefficients). For example, if the study date was Sep 24 1999, add the following line to the beginning of the data file:
# 1999-09-24

ECAT931 (put out of operation in the end of April 2005)

Scanditronics on-line detector was located at ECAT931 during the years it was in operation. On-line detector is working fine, and can be used in connection with some other scanner, when necessary.

Raw on-line detector data is stored in a specific format. After the necessary processing and correction steps, the data format is the same as in any other TAC files.

The raw blood data from ECAT931 studies were written in directory S:\Lab\plasma\ecat\. From this directory the original data may have been moved to group disks and MO or CD-ROM disks. Any new data is stored in PETO.