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Medical imaging technology has progressed immensely over the years to extract the leverage of existing technologies and spread them to as many people as possible.
FREMONT, CA: Medical imaging is often understood within the confined pictures of a radiograph or X-ray, as it is more commonly known. Radiographs are the oldest and most frequently employed medical imaging technique. Today, there is so much to this intriguing and innovative science field. Many recent advancements in medical imaging technology have delineated areas where major developments are anticipated in the near future.
Medical imaging technology includes any method that allows medical professionals to view the body's interior or areas that are not visible to the naked eye. These structures’ visualisation helps in disease diagnosis, treatment planning, and execution via image-guided intervention, monitoring, and surveillance.
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Today, medical imaging is vital to disease diagnosis and management. X-ray was the earliest form of diagnostic medical imaging. Later, radiographic imaging emerged, replacing traditional X-rays with computed tomography (CT), combining computer processing power with X-ray imaging. CT scanning takes images in three different stages. This technology has undergone refinement over the years reducing image slices’ thickness and alleviating image acquisition time using spiral CT.
Then came magnetic resonance imaging (MRI), when radiation exposure concerns during medical imaging were at their peak. This imaging system uses natural magnetic fields to obtain an internal body structure image. Despite its initial limited diagnostic use, improvements in the equipment have allowed MRI to become the imaging modality of choice for soft tissues and vascular structures. The latest MRI machines are compact, open devices that do not make patients feel claustrophobic.
Ultrasonography, another imaging modality, does not employ radiation but rather uses reflected sound waves to capture pictures of internal organs. A primary advantage of ultrasound is its portability. It has gained widespread medical application for bedside examinations, studying vascular structures, and assessing foetal health in obstetrics.
Other advancements in medical imaging techniques have harnessed the power of nuclear radioisotopes. Positron emission tomography (PET) allows radiolabeled molecules like body tissues to take up glucose. Furthermore, sensors detect them, and their distribution provides ideas and methods for diagnosis. The emergence of contrast media has paved the way for site-specific imaging such as CY angiography. Vascular structures can be easily visualised by injecting radiolabeled material into the bloodstream. This also helps in recognising vascular anomalies and bleeders. Certain tissues can take up radiolabeled molecules, narrowing down a diagnosis. For example, bone scanning uses technetium-99m, and thyroid tissues use iodine-131. Two or more imaging techniques are often amalgamated to derive a definite idea of what is happening in the patient’s body. With these advances, clinicians can now manipulate images to gain greater insights and information from a data set.
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