Separating bone from air in MR data is one of the major challenges in using MR images to derive synthetic CT. The problem is further complicated when the anatomic regions filled with air are altered across scans due to air mobility, for instance, in pelvic regions, thereby the air regions estimated using an ultrashort echo time (UTE) sequence are invalid in other image series acquired for multi...

Purpose : Quantitative synthetic MRI enables simultaneous quantification of T1 and T2 relaxation times proton density, as well acquisition various contrast-weighted images1). However, MR angiography (MRA) scans could not be obtained using MRI. Thus, the present study aimed to develop a deep-learning algorithm for acquire MRA without additional scanning time.

Background The superior soft tissue contrast of magnetic resonance imaging (MRI) compared to computed tomography (CT) has urged the integration of MRI and exclusion of CT in prostate radiotherapy treatment, referred to as an MRI-only workflow. Such a workflow can eliminate image registration errors between the CTand MR-images but incorporates multiple challenges. MR-images lack electron density...

Quantum states extended over a large volume in phase space have oscillations from quantum interferences in their Wigner distribution on scales smaller than variant Planck's over 2pi [W. H. Zurek, Nature (London) 412, 712 (2001)]]. We investigate the influence of those sub-Planck-scale structures on the sensitivity to an external perturbation of the state's time evolution. While we do find an ac...

The authors previously described magnetic resonance (MR) image synthesis, a process that enables the investigator to manipulate imaging parameters retrospectively and generate or "synthesize" the image that corresponds to various arbitrary scanning factors. They demonstrate the validity and utility of synthetic spin-echo images in cerebral imaging. As a test of their method, spin-echo images ar...

A synthetic heptadecapeptide corresponding to part of the NH2-terminal 17 residues of chicken gizzard myosin light chain (Mr = 20,000), Ser-Ser-Lys-Thr-Thr-Lys-Arg-Pro-Gln-Arg-Ala-Thr-Ser-(P)-Asn-Val-Phe-Ser-NH2, was readily phosphorylated by the myosin light chain kinase isolated from the same tissue. The synthetic peptide was phosphorylated stoichiometrically at serine 13, the same residue ph...

Background and purposeThe superior tissue contrast of magnetic resonance (MR) compared to computed tomography (CT) led an increasing interest towards MR-only radiotherapy. For the latter, dose calculation should be performed on a synthetic CT (sCT). Patient-specific quality assurance (PSQA) methods have not been established yet this study aimed assess several software-based solutions.Materials ...

We have previously developed a retrospective 4D-MRI technique using body area as the respiratory surrogate, but generally, the reconstructed 4D MR images suffer from severe or mild artifacts mainly caused by irregular motion during image acquisition. Those image artifacts may potentially affect the accuracy of tumor target delineation or the shape representation of surrounding nontarget tissues...