Category: Biomedical Diagnostic Instruments
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The Function of a PET scan in Biomedical Diagnostics
The radionuclides that are employed in a PET scan as part of radiopharmaceuticals work best when used for imaging certain physiological properties. Combined with a CT scan or an MRI, a PET scan is good for locating things such as tumours. As a matter of fact, a PET scan can light up for the brain,…
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Comparison of Imaging Modes – Ultrasound, CT & MRI
How the three imaging modalities compare? We examine each of the three diagnostic imaging methods as discussed in the following sections: Ultrasound Imaging Unlike other imaging modalities, ultrasound resolution and penetration depends on the center frequency and type of frequency selected. The resolution is spatially variant and depends on both the size of the active…
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The Process of Setting up a PET scan
The ability of a PET scanner to target specific functions or objects e.g. tumour makes it a very effective tool in non-invasive medical imaging and diagnostics. The process involves using radionuclides, so PET scanners aren’t available at every medical facility. Related: Radionuclide Imaging Techniques The process of setting a PET scan involves the following steps:…
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Radionuclide Imaging Techniques
The radionuclide imaging devices place radionuclides, called tracers, within the body. We have 3 types of imaging that include the following: Let’s discuss briefly each of the above listed imaging techniques: Single Photon Emission Computed Tomography (SPECT) SPECT uses a radionuclide with relatively longer half-life. (The half-life is the time, it takes half the radionuclides…
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The Application of Echocardiography in Cardiovascular Diagnosis
The key application of ultrasound in cardiovascular diagnosis is echocardiogram. It utilizes M-scan technique in the imaging. In the echocardiogram, the movements of the valves and other structures of the heart are displayed as a function of time. The display also includes an electrocardiogram to provide more information on the heart. From the echocardiogram, the…
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The Instrumentation for the Medical Use of Radioisotopes Diagnosis
Radioisotopes diagnosis technique helps in obtaining image of the body anatomy and functions. The images are obtained by detecting energy emitted from the radioactive substance injected in the patient either intravenously or by mouth. The radiation emitted from the patient is similar to that emerging during radiography or CT scanning. The radioisotopes images help in…
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Ultrasound vs. X-rays, what are the differences?
Both ultrasound and X-rays are used in medical diagnosis. We look at the differences in their physical properties and the applications differences between the two as applied in medical diagnosis. Table 1: Physical Property differences between Ultrasound and X-rays Property Ultrasound X-rays Wave type Longitudinal Electromagnetic Transmission requirement of medium Elastic No medium is required…
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How Ophthalmic Scanning of the Eye is done
The ultrasound is widely used for the diagnostics scanning of the eye. A-scan and B-scan modes of display are used in ophthalmic scanning. The transducer is placed directly over the eye of the patient while performing ophthalmic scanning. The high frequency sound waves that travel through the eye and the reflections (echoes) of these waves…
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How a Tonometer is used to Measure Eye Pressure
Pressure in the eye is called Intraocular Pressure (IOP). Tonometer is the instrument that is used to determine IOP. The presence of any elevated IOP can be dangerous because people with varying degree of IOP elevation may develop certain damage to the optic nerve. The optic nerve collects all the visual information from the retina…
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How Ophthalmoscope is used for Eye Examination
Ophthalmoscope is an instrument used to examine the interior of the eye including the lens, retina, and optic nerve. It is used primarily to: Ophthalmoscope is based on the principle that, light entering the pupil is reflected back to its source. Furthermore, the light follows the same path out of the eye that it took…