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Accurate evaluation of morphological changes in articular cartilage are necessary for early detection of osteoarthritis (OA). 3T magnetic resonance imaging (MRI) has highly sensitive contrast resolution and is widely used clinically to detect OA. However, synchrotron radiation phase-contrast imaging computed tomography (SR-PCI) can also provide contrast to tissue interfaces that do not have sufficient absorption differences, with the added benefit of very high spatial resolution. Here, MRI was compared with SR-PCI for quantitative evaluation of human articular cartilage. Medial tibial condyles were harvested from non-OA donors and from OA patients receiving knee replacement surgery. Both imaging methods revealed that average cartilage thickness and cartilage volume were significantly reduced in the OA group, compared to the non-OA group. When comparing modalities, the superior resolution of SR-PCI enabled more precise mapping of the cartilage surface relative to MRI. As a result, MRI showed significantly higher average cartilage thickness and cartilage volume, compared to SR-PCI. These data highlight the potential for high-resolution imaging of articular cartilage using SR-PCI as a solution for early OA diagnosis. Recognizing current limitations of using a synchrotron for clinical imaging, we discuss its nascent utility for preclinical models, particularly longitudinal studies of live animal models of OA. [ABSTRACT FROM AUTHOR]

The article focuses on a pilot study that aims at evaluating lymph node enhancement in the head and neck of dogs with an indirect magnetic resonance (MR) lymphography. It describes the methodology of the study in which MR imaging was conducted on five dogs using gadoversetamide and Gadofluorine M contrast agents. It reveals the efficiency of indirect MR lymphography for diagnosing metastatic lymph nodes in dogs with cancer.

The article cites a case of a 5-month-old girl who was diagnosed with subacute necrotizing encephalomyelopathy or Leigh disease. She was presented with failure to thrive, developmental regression, visual inattention, and nystagmus. The patient had transient episodes of stiffening of the arms and legs, and arching of the back. Magnetic resonance imaging and magnetic resonance spectroscopy were performed.

The use of magnetic resonance imaging (MRI) during pregnancy is associated with concerns among patients and health professionals with regards to fetal safety. In this work, the Canadian Association of Radiologists (CAR) Working Group on MRI in Pregnancy presents recommendations for the use of MRI in pregnancy, derived from literature review as well as expert panel opinions and discussions. The working group, which consists of academic subspecialty radiologists and obstetrician-gynaecologists, aimed to provide updated, evidence-based recommendations addressing safety domains related to energy deposition, acoustic noise, and gadolinium-based contrast agent use based on magnetic field strength (1.5T and 3T) and trimester scanned, in addition to the effects of sedative use and occupational exposure. [ABSTRACT FROM AUTHOR]