By Nicusor Iftimia, William R. Brugge, Daniel X. Hammer
This publication offers scholars, academics, researchers and clinicians with a powerful and validated resource of knowledge on complicated optical applied sciences that exhibit genuine promise of being translated to medical use.
Read Online 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)
MRI uses a powerful magnetic ﬁeld to align the nuclear magnetization of (usually) hydrogen atoms in water in the body. , protons) to produce a rotating magnetic ﬁeld detectable by the scanner. This signal can be manipulated by additional magnetic ﬁelds to build up enough information to reconstruct an image of the body. DIAGNOSTIC IMAGING TECHNOLOGIES 23 MRI Scanner Construction and Operation The magnet is the largest and most expensive component of the scanner, and the remainder of the scanner is built around it.
This ﬂattened beam is then collimated using special collimation systems and directed toward the patient for treatment delivery. The photon beams are created through a bremsstrahlung process: the electron beam created as described above hits a target made from a high-atomicnumber material. Photons with a continuous energy spectrum are emitted as a result of electronic interactions in the target material. The photon beam is ﬂattened using a ﬂattening ﬁlter, collimated, and used for treatment [15,40,41].
However, higher ﬁeld strengths require more costly magnets with higher maintenance costs and have increased safety concerns. 5 T are a good compromise between cost and performance for general medical use. 0 T may be desirable. The RF transmission system consists of an RF synthesizer, a power ampliﬁer, and a transmitting coil. This is usually built into the body of the scanner. The receiver consists of a coil, a preampliﬁer, and a signal processing system. , the rectum). A recent achievement in MRI technology has been the development of sophisticated multielement phased-array coils which are capable of acquiring multiple channels of data in parallel [20,21].