All patients who achieved a response had a reduction in PET activity from baseline.
A key endpoint of our work is a DA movie (in contrast to a movie of PET activity) resulting from the estimation of transient DA changes at each voxel in the dynamic data.
As attenuation for electron dense areas at CT energies (up to 140 keV) is typically an order of magnitude higher than attenuation at the PET photon energy (511 keV), an overestimation of PET activity can be expected in those areas after CT-based attenuation correction.
Reversely, the scatter will be undercorrected leading to an overestimation of PET activity.
More specifically, there will be an underestimation of PET activity after attenuation correction due to this assignment of zero attenuation in the artifactual MR-based attenuation maps.
Two breakdown products of 37 kDa and 72 kDa were generated from in vitro Pet activity against a recombinant GST-tagged construct that contained a 109 kDa fragment of α-fodrin representing the 8th to the 14th spectrin repeats (codons 809 1529) [ 190].
The aim of this study was to assess the prevalence and magnitude of regional and absolute bias in PET activity as a result of ignoring susceptibility artifacts in the dental region during MR-AC of combined PET/MR images of the head and head/neck.
A correlation was noted between PET activity 2 weeks after initiation of infliximab treatment and the disease activity score 28 after 14 and 22 weeks of treatment [ 31].
We report the average PET activity value (kBq/mL) of a spherical VOI with a diameter of 20 mm, centrally placed in the largest sphere (with an inside diameter of 37 mm).
Correlation between upper, lower, right, and left endplate PET activity with corresponding pedicle screw entry point PET activity.
