1490 Objectives To compare the quantitative accuracy of PET brain scans with low dose and
clinical dose CT based attenuation corrections, phantom studies were acquired with a 64 …

2609 Objectives Generally, in patients with nervous system diseases undergoing brain
PET/CT imaging, they also have enhanced MRI or enhanced CT so that the CT images in …

2629 Objectives We conducted Hoffman phantoms studies to characterize the effect of
lowering CT dose on quantification of regional brain PET. Methods A Hoffman phantom …

It is generally well accepted that transmission (TX)-based non-uniform attenuation correction
can supply more accurate absolute quantification; however, whether it provides additional …

Purpose Quantitative image reconstruction in positron emission tomography (PET) requires
an accurate attenuation map of the object under study for the purpose of attenuation …

A spatial bias in brain PET/MR exists compared with PET/CT, because of MR-based
attenuation correction. We performed an evaluation among 4 institutions, 3 PET/MR …

PET/MRI scanners cannot be qualified in the manner adopted for hybrid PET/CT devices.
The main hurdle with qualification in PET/MRI is that attenuation correction (AC) cannot be …

Our purpose was to investigate the minimal required submillisievert ultra-low-dose CT dose
level and the corresponding tube current and voltage for reliable attenuation correction and …

Although diagnostic quality CT relies on the administration of contrast agents to allow
improved lesion detectability, the misclassification of contrast medium as high density bone …

502 Objectives Dose reduction for PET/CT can be achieved through proper selection of CT
acquisition. If the sole purpose of the CT is for PET attenuation correction (CTAC) the CT …