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For more than a century, medicine has used diagnostic imaging. Nonetheless, enormous progress has been achieved in the past half-century, as various imaging techniques have provided unprecedented information about the composition and operation of the human body's internal organs. Computerized tomography, ultrasound, and magnetic resonance imaging are three techniques that have emerged in the field.
Fremont, CA: Diagnostic imaging has been used in medicine for over a century. Nonetheless, enormous progress has been achieved in the past half-century, as various imaging techniques have provided unprecedented information about the composition and operation of the human body's internal organs. Here are a few individual techniques that have emerged in the field:
Computerized Tomography (CT)
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An X-ray beam that is partially absorbed or dispersed within the organ being scanned is used in CT scanning. A cross-sectional picture of the body is created when the leftover X-rays go down many linear channels and land on a spinning detector. The amount of radiation used in a CT scan is more than in a traditional X-ray; however, the radiation dosage also depends on the body's size, the number of sequences, and the required picture quality/resolution.
Occasionally, contrast CT scans are performed using heavy-molecule dyes to enhance the resolution of the soft tissues. Iodine-based substances are employed as kidney function indicators and water-soluble dyes. These alter the way the imaging beam interacts with the organs rather than giving them color.
Magnetic Resonance Imaging (MRI)
In magnetic resonance imaging (MRI), protons in hydrogen atoms comprise most of the human body and are aligned using magnetic fields. Protons in the body portion being examined are excited, and the brief radio wave disrupts the alignment pulses that the MRI scanner generates. High-resolution pictures of interior organs and structures can be obtained by detecting the radio waves that the realigning protons generate.
As a result, the water content and magnetic characteristics of the body component being scanned determine the MRI signal since the realignment speed differs among tissues, resulting in distinct signals in each. A computer integrates millions of radio wave emissions to provide an intricate image of the interior of the organ or body.
Ultrasound (US)
US imaging creates precise pictures of inside body structures by reflecting sound waves with a frequency of 1 to 12 MHz off of such structures. The fundamental idea is that reflection depends on the distance between the reflecting surface and the sound wave's source. Echocardiography is vital when evaluating the heart valve's size, function, and health.
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