If you cannot make your appointment for any reason, please contact the Diagnostic Imaging Reception Desk at The earlier you can contact us the better as we will be able to help get someone else in for their appointment sooner. The Health Sciences Centre was one of the first facilities in Ontario to go fully digital. People who have diagnostic imaging tests ordered by their doctor register at the Diagnostic Imaging desk. Please arrive 15 minutes before your test unless otherwise advised. Some tests require that you arrive up to one hour before your appointment time.
Please bring your health card. You may bring a companion with you to your test, though generally you will be asked to go to the examination room alone.
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Exceptions are made for children and for people who may require extra assistance. Please discuss your needs when you register. Each test is different, so we have created brochures that provide information on each type of diagnostic imaging procedure within the department. Please click on one of the links below for more information about your procedure.
Diagnostic imaging relies upon high-tech equipment to quickly and accurately image the inside of the human body. It takes skill and training to use this equipment. In some cases, our technologists also examine and interpret the images. These healthcare professionals are a key part of the diagnostic process, helping doctors, primary care providers, and specialists get the images they need to better diagnose and treat their patients. MRTs at the Health Sciences Centre include five distinct technology-related disciplines in the healthcare field: Radiological Technologists provide diagnostic X-rays and other associated diagnostic imaging procedures.
At Riverview our team of physicians are all board certified in radiology, and some are also board certified in radiology specialties, including vascular, interventional, and neuroradiology. Technologists — your technologist will be the one performing many of the various types of exams, including X-rays, CT scans, MRIs, and ultrasounds.
Our technologists have advanced certifications in radiology, and are dedicated to providing you with the best health care experience each and every time you are with us. Nurses — our experienced and caring, Magnet-award winning nurses are here to assess and document your status during your visit so they may discuss your personalized needs with your physician. They will also provide you with the resources you need regarding your procedure and keep you informed as to what you can expect during your visit.
Through the advanced Certus System, Riverview is treating patients with this ground breaking 2.
This Ablative Power System offers a number of benefits including unmatched control, strong efficacy, and low complication rates that are not offered by other common treatment modalities. Kidney, liver, lung and bone. Learn how microwave ablative therapy helped a young man from Middletown return to an active lifestyle. Learn more about our comprehensive imaging services by visiting the pages below: Dermatology and wound care are two modalities that use visible light imagery. Diagnostic radiography designates the technical aspects of medical imaging and in particular the acquisition of medical images.
The radiographer or radiologic technologist is usually responsible for acquiring medical images of diagnostic quality, although some radiological interventions are performed by radiologists. As a field of scientific investigation, medical imaging constitutes a sub-discipline of biomedical engineering , medical physics or medicine depending on the context: Research and development in the area of instrumentation, image acquisition e.
Many of the techniques developed for medical imaging also have scientific and industrial applications. Two forms of radiographic images are in use in medical imaging. Projection radiography and fluoroscopy, with the latter being useful for catheter guidance. These 2D techniques are still in wide use despite the advance of 3D tomography due to the low cost, high resolution, and depending on the application, lower radiation dosages with 2D technique.
This imaging modality utilizes a wide beam of x rays for image acquisition and is the first imaging technique available in modern medicine. A magnetic resonance imaging instrument MRI scanner , or "nuclear magnetic resonance NMR imaging" scanner as it was originally known, uses powerful magnets to polarize and excite hydrogen nuclei i. Radio frequency antennas "RF coils" send the pulse to the area of the body to be examined. The RF pulse is absorbed by protons, causing their direction with respect to the primary magnetic field to change. When the RF pulse is turned off, the protons "relax" back to alignment with the primary magnet and emit radio-waves in the process.
This radio-frequency emission from the hydrogen-atoms on water is what is detected and reconstructed into an image. The resonant frequency of a spinning magnetic dipole of which protons are one example is called the Larmor frequency and is determined by the strength of the main magnetic field and the chemical environment of the nuclei of interest. MRI uses three electromagnetic fields: Like CT , MRI traditionally creates a two-dimensional image of a thin "slice" of the body and is therefore considered a tomographic imaging technique. Modern MRI instruments are capable of producing images in the form of 3D blocks, which may be considered a generalization of the single-slice, tomographic, concept.
Unlike CT, MRI does not involve the use of ionizing radiation and is therefore not associated with the same health hazards.
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For example, because MRI has only been in use since the early s, there are no known long-term effects of exposure to strong static fields this is the subject of some debate; see 'Safety' in MRI and therefore there is no limit to the number of scans to which an individual can be subjected, in contrast with X-ray and CT. However, there are well-identified health risks associated with tissue heating from exposure to the RF field and the presence of implanted devices in the body, such as pacemakers.
These risks are strictly controlled as part of the design of the instrument and the scanning protocols used. Because CT and MRI are sensitive to different tissue properties, the appearances of the images obtained with the two techniques differ markedly. In CT, X-rays must be blocked by some form of dense tissue to create an image, so the image quality when looking at soft tissues will be poor.
In MRI, while any nucleus with a net nuclear spin can be used, the proton of the hydrogen atom remains the most widely used, especially in the clinical setting, because it is so ubiquitous and returns a large signal. This nucleus, present in water molecules, allows the excellent soft-tissue contrast achievable with MRI. It is possible to differentiate tissue characteristics by combining two or more of the following imaging sequences, depending on the information being sought: Different from the typical concept of anatomic radiology, nuclear medicine enables assessment of physiology.
This function-based approach to medical evaluation has useful applications in most subspecialties, notably oncology, neurology, and cardiology. Gamma cameras and PET scanners are used in e. Relatively short-lived isotope , such as 99m Tc is administered to the patient. Isotopes are often preferentially absorbed by biologically active tissue in the body, and can be used to identify tumors or fracture points in bone. Images are acquired after collimated photons are detected by a crystal that gives off a light signal, which is in turn amplified and converted into count data.
Fiduciary markers are used in a wide range of medical imaging applications. Images of the same subject produced with two different imaging systems may be correlated called image registration by placing a fiduciary marker in the area imaged by both systems. In this case, a marker which is visible in the images produced by both imaging modalities must be used. By this method, functional information from SPECT or positron emission tomography can be related to anatomical information provided by magnetic resonance imaging MRI.
Medical ultrasonography uses high frequency broadband sound waves in the megahertz range that are reflected by tissue to varying degrees to produce up to 3D images. This is commonly associated with imaging the fetus in pregnant women. Uses of ultrasound are much broader, however.
Other important uses include imaging the abdominal organs, heart, breast, muscles, tendons, arteries and veins.
While it may provide less anatomical detail than techniques such as CT or MRI, it has several advantages which make it ideal in numerous situations, in particular that it studies the function of moving structures in real-time, emits no ionizing radiation , and contains speckle that can be used in elastography. Ultrasound is also used as a popular research tool for capturing raw data, that can be made available through an ultrasound research interface , for the purpose of tissue characterization and implementation of new image processing techniques. The concepts of ultrasound differ from other medical imaging modalities in the fact that it is operated by the transmission and receipt of sound waves.
The high frequency sound waves are sent into the tissue and depending on the composition of the different tissues; the signal will be attenuated and returned at separate intervals. A path of reflected sound waves in a multilayered structure can be defined by an input acoustic impedance ultrasound sound wave and the Reflection and transmission coefficients of the relative structures.
It is also relatively inexpensive and quick to perform. Ultrasound scanners can be taken to critically ill patients in intensive care units, avoiding the danger caused while moving the patient to the radiology department.
diagnostic imaging | Definition & Types | omyhukocow.tk
The real-time moving image obtained can be used to guide drainage and biopsy procedures. Doppler capabilities on modern scanners allow the blood flow in arteries and veins to be assessed. Elastography is a relatively new imaging modality that maps the elastic properties of soft tissue. This modality emerged in the last two decades. For example, cancerous tumours will often be harder than the surrounding tissue, and diseased livers are stiffer than healthy ones. The wide clinical use of ultrasound elastography is a result of the implementation of technology in clinical ultrasound machines.
Photoacoustic imaging is a recently developed hybrid biomedical imaging modality based on the photoacoustic effect.
It combines the advantages of optical absorption contrast with an ultrasonic spatial resolution for deep imaging in optical diffusive or quasi-diffusive regime. Recent studies have shown that photoacoustic imaging can be used in vivo for tumor angiogenesis monitoring, blood oxygenation mapping, functional brain imaging, and skin melanoma detection, etc.
Tomography is the imaging by sections or sectioning. The main such methods in medical imaging are:. When ultrasound is used to image the heart it is referred to as an echocardiogram. Echocardiography allows detailed structures of the heart, including chamber size, heart function, the valves of the heart, as well as the pericardium the sac around the heart to be seen. Echocardiography uses 2D, 3D, and Doppler imaging to create pictures of the heart and visualize the blood flowing through each of the four heart valves.