By Nicusor Iftimia, William R. Brugge, Daniel X. Hammer
This e-book offers scholars, academics, researchers and clinicians with a robust and tested resource of data on complex optical applied sciences that convey actual promise of being translated to scientific use.
Read or Download Advances in Optical Imaging for Clinical Medicine (Wiley Series in Biomedical Engineering and Multi-Disciplinary Integrated Systems) PDF
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Extra resources for Advances in Optical Imaging for Clinical Medicine (Wiley Series in Biomedical Engineering and Multi-Disciplinary Integrated Systems)
What is actually measured indirectly is the blood ﬂow to various parts of the brain, which is generally believed to be correlated and has been measured using the tracer oxygen-15. Standard FDG-PET of the brain may also be used for early diagnosis of Alzheimer’s disease . In clinical cardiology, FDGPET can identify hibernating myocardium and atherosclerosis. PET scanning is noninvasive, but it does involve exposure to ionizing radiation. The total dose of radiation is small, however, usually around 7 mSv.
In the M-mode the images are created from echo amplitude information along a single scanline through tissue, but the information is displayed as the brightness of the light point, as in the B-mode. The M-mode is designed to record motion, such as in monitoring cardiac valves. The US waveform is a short pulse, characterized by the peak frequency and the bandwidth. The US beamwidth at the focal point of the transducer and the depth of focus are linearly proportional to the US wavelength. If the US frequency increases, the wavelength decreases, so the beamwidth and pulse duration decrease; consequently, the US axial and lateral resolutions, assessed by the minimum separation of two point targets when their images could just be distinguished, improve.
This can heat the body to the point of risk of hyperthermia in patients, particularly in obese patients or those with thermoregulation disorders. Also, the rapid switching on and off of the magnetic ﬁeld gradients is capable of causing nerve stimulation. Rapidly switched magnetic gradients interact with the main magnetic ﬁeld to cause minute expansions and contractions of the coil itself, resulting in loud noises and vibrations. Appropriate use of ear protection is essential for anyone inside the MRI scanner room during the examination.