PPT-Contrast Media in M edical Imaging Techniques

What are contrast materials and how do they work Contrast materials also called contrast agents or contrast media are used to improve pictures of the inside of the body produced by xrays computed tomography CT magnetic resonance MR imaging and ultrasound Often contrast materials allow the radiologist to distinguish normal from abnormal conditions. Upper GIT congenital . anomalies . in neonates/infants. Hidayatullah Hamidi. 3. rd. year radiology resident, FMIC, Kabul. November 2015. www.afrad.org. Work steps. What is the question?. What is my responsibility?. Mariana DeFreitas – PGY1. Learning Objectives. Acquire a broad understanding of imaging decisions encountered in primary care. Become more comfortable with choosing appropriate imaging studies. Become familiar with appropriateness criteria imaging resources. JWST:Coronagraphy. 2. High Contrast Imaging allows observing. Extended emission. surrounding stars. Debris disks. AGN. . hosts. Faint companions. High contrast imaging combines the suppression of light from the host (“optical cancellation”) with post-processing by subtracting the scaled point-spread function (PSF) from the science image. Gastric Pathologic Conditions: . A Primer for Radiologists. Ashley C. Anderson. , MD. John . D. Millet, MD. , MHS . Matthew S. Manganaro. , MD. Ashish . P. Wasnik, MD. Author Affiliations:. Department of Radiology. Suppat . ittimakin. , MD. . Contrast media. Substance used to enhance the contrast of the structures or fluid within the body in medical imaging. Types of contrast agent. - Iodinated contrast agent. Blood pool CT contrast agents. (Confined to the intravascular space, highlighting blood vessels). Passive targeting agents . (. Reticulo. -endothelial system (RES) or through the enhanced permeability and retention (EPR) effect). Computed tomography in oral and maxillofacial radiology. Computed tomography (CT) is today commonly used in imaging of the maxillofacial area. Conventional CT examinations are usually performed in medical X-ray departments. However, a relatively new technique named cone-beam computed tomography (CBCT) or digital volume tomography (DVT) has now also become available for dental purposes. The advantage with this technique is a lower radiation dose compared to conventional CT. Common examples when DVT is used are; for diagnosing the position of impacted canines and suspected root . The physical background of medical . tomographies. Lecture. 7. Modern imaging techniques in biology: Lecture 7. 1. MRI. . thematics. Microscopic and macroscopic magnetization. The Bloch equation. T. permit radiographic visualisation of the details of the internal structure or organs that would not otherwise be demonstrable. .. SODIUM IODIDE. -Used to treat syphilis in1920s. -Produced . radioopacification. Adrenal glands can be affected by a variety of lesions. Adrenal lesions can either be primary, of adrenal origin, or secondary to other pathologies. Primary adrenal lesions can further be either of cortical or medullary origin. Functioning adrenal lesions can also give clues to the histologic diagnosis and direct workup. Over the years, various imaging techniques have been developed that have increased diagnostic accuracy and helped in better characterization of adrenal lesions non-invasively. In the first part of the two part series, we review adrenal imaging techniques and adrenal cortical tumors such as adenomas, adrenocortical tumors, adrenal hyperplasia and oncocytomas. BIOE 477/598DP. High . echogenicity. Low attenuation. Low blood solubility. Low diffusivity. Ability to traverse pulmonary system. Lack of biological effects in repeat exposures. Ideal Characteristics of an Ultrasound Probe. BioE. 477/598DP. Module 1. Dipanjan Pan, PhD, FRSC, FAHA, FACC. Department of Bioengineering. Beckman Institute of Advanced Imaging and Science. Department of Materials Science and Engineering. dipanjan@illinois.edu. Plain X-Ray Films. Myelogram – injection of contrast medium in CSF followed by x-ray images. Rarely performed. now-a-days. Computed Tomography (CT Scan) . Magnetic Resonance Imaging (MRI). Discogram - injection of contrast medium in the disc followed by x-ray images . Prof. Ibrahim Alrashid. A contrast medium is a substance that is administered to the patient that is either more . radiopaque. or more radiolucent than the surrounding tissue. This allows assessment of the position, size, shape and internal architecture of the organ that was not apparent on the original radiograph. .