The water and macromolecular environment determine the T1 relaxation time of tissues, so T1 is markedly decreased in the ZCC as compared to the superficial cartilage in knees. Furthermore, increased T1 is associated with cartilage degeneration. In the ZCC, the short T1 component accounts for about 70% of the signal, with another 30% from the adjacent long T1 component likely to be due to the partial volume effect
These new techniques substantially improve image quality and reduce the partial volume effect
Exploring the Partial Volume Effect
. One of the more commonly discussed topics regarding tissue segmentation from medical images is that of the Partial Volume Effect
Although AD[C.sub.WF] and AD[C.sub.SF] were measured from the coregistered fibroglandular tissue from the segmented FT mask, there was inevitably partial volume effect
with fat, especially in the boundary of the FT mask adjacent to the fatty tissue.
Previous resolution based research demonstrated the quality of images in MRI at the expense of signal to noise ratio, the acquisition time and partial volume effect
but work on low resolution using QSM was not explored well12, 13.
Meikle, "Characterisation of partial volume effect
and region-based correction in small animal positron emission tomography (PET) of the rat brain," NeuroImage, vol.
The IF is estimated with an Image-Derived Input Function procedure using MRI information to correct the partial volume effect
of the images.
However, because MRI was acquired at 1 cm slice thickness, and the L3 vertebra had a height of 2.4-2.9 cm (measured at the center of the vertebra) in this study, FFMRI was subjected to partial volume effect
. Another error source of FFMRI was due to the miscalculations at approximately 45% fat content.
Some of them are beam hardening, noise, Compton scattering, partial volume effect
, cardiac, and respiratory motion [1, 2].
Partial volume effect
appears as "blurring" over sharp edges.
To give absolute activity, the system must be calibrated and each image must be corrected for a number of degrading effects (e.g., scatter, attenuation, partial volume effect
, and dead time).
High-resolution CT examination, in particular, coronal thin-section CT scan, can assist the diagnosis of almost all types of CSF rhinorrhea, help detect the skull base defects, localize the leakage site, select the surgical approach, and is independent on leak activity at the time of imaging.[sup] However, due to the complexity of skull base structure and partial volume effect
, it has difficulty localizing single or multiple leaks in complex and multiple skull base fractures.