The purpose of the study is to evaluate the physical performance of a Biograph mCT Flow R PET/CT system (Siemens Healthcare, Germany) and to. to fundamentally change how PET imaging is performed. Powered by Siemens’ revolutionary FlowMotion™ technology,. Biograph mCT Flow™ is the world’s first. Biograph mCT Flow with FlowMotion™ technology combines our standard- setting PET/CT with a unique system design that enables continuous motion of.
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Mvt CTM scans were acquired with a table speed of 1. Furthermore, the axial placement of the off-center axial point sources was changed from one fourth of the axial FOV from the center to three eighth of the axial FOV from the center, bipgraph. The system sensitivity was then computed as the ratio between the true count rate with no absorption and the starting activity.
The scatter fraction was Dynamic whole body PET parametric imaging: A second scan of biogralh same region in CTM mode was acquired at a table speed of 0.
The CRCs were similar in both acquisition modes. Despite the modifications from the to the standard, the results for the system sensitivity, the count rates, NECR, scatter fraction, corrections for count losses and random measurements as well as the count rate error are in accordance with published values for the mCT system [ 6 ] following the NEMA NU standard.
Previous studies have shown that by incorporating PSF modeling mcct the image reconstruction, an overestimation of the CRC can be observed, in particular, when no post-filtering is applied [ 252829 ].
Biograph mCT 20 Excel – Siemens Healthineers Global
The corrected true coincidence count rate was recorded as a function of sleeve thickness and extrapolated to a zero thickness sleeve. This can be used to optimize the protocols, e. Image quality phantom hot spheres at the center of the axial FOV The calculated activities at the start of the second scan were 5. Author information Article notes Copyright and License information Disclaimer. The relative count rate error at the activity concentration of the NECR peak This difference warrants further discussion.
The maximum and minimum errors for all activity concentrations are depicted in Fig.
Support Center Support Center. A possible explanation could be the differences in reconstruction algorithms and post-filtering used in [ 6 ] and here.
Biograph mCT 20 Excel
All procedures performed in studies involving human participants were approved by the regional ethics committee and were in accordance with the Helsinki declaration.
Central slice of the image quality phantom for sequential a and CTM b acquisition modes.
Data were reconstructed with an ordered-subset expectation maximization OSEM [ 25 ] 3D iterative algorithm, using 2 iterations i and 24 subsets sand mctt with 2 iterations and 21 subsets applying PSF correction and TOF. Biobraph patient handling system PHS contains a horizontal magnetic drive system that enables a continuous table motion with a positioning accuracy of less than 0.
Of note, the standard permits for a range of image reconstruction methods.
Also, advanced acquisition protocols like described by Karakatsanis et al. This can be attributed in part to the generation of Gibbs artifacts at the edge of the reconstructed object, which are particularly noticeable in smaller objects [ 2529 ]. However, this study was performed on a different system with an axial FOV of There were no biogralh differences in image quality of the patient scans Fig.
Table speeds range from 0. Online random subtraction was applied from a delayed coincidence window.
Biograph mCT Flow – Siemens Healthineers USA
For resolution measurements, an 18 F point source inside a glass capillary tube was used. The expected value of the true count rate is gained by a fit through all data below the peak NECR standard as opposed to the extrapolated values from the last three acquisitions standard. For viograph purpose of comparison between systems, this may not be sufficiently accurate.
Healthcare Siemens White Paper. Within the SS protocol, the table is in a fixed position during an acquisition of data in the FOV and subsequently moves to the next position to acquire data of an axial range greater than the axial FOV of the system.
For this acquisition protocol, planning and scanning are restricted by the fixed size of the detector array.
The axial sensitivity profiles with the line source placed at the center of the FOV and cm radial offset are shown in Fig. Axial sensitivity profile for the measurements with the line source in niograph center of the field of view and at cm radial offset. While the difference in error may be small, the exclusion of the end slices as permitted in the NEMA NU protocol should be followed anyway, as these end slices often suffer from high noise levels due to the low sensitivity of the scanner at the end of the axial FOV Bilgraph.
Image quality results for 4: