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Biology Today: An Issues Approach is a college-oriented Biology textbook by Eli C. Minkoff and Pamela J. Baker designed to integrate the teaching of biological concepts within the context of current societal issues relating to these topics. [1] It is the original issues-oriented introductory-level general biology textbook. [2]
A 2012 review did not find an association between medical radiation and cancer risk in children noting however the existence of limitations in the evidences over which the review is based. [169] CT scans can be performed with different settings for lower exposure in children with most manufacturers of CT scans as of 2007 having this function ...
X-ray computed tomography (CT), or Computed Axial Tomography (CAT) scan, is a helical tomography technique (latest generation), which traditionally produces a 2D image of the structures in a thin section of the body. In CT, a beam of X-rays spins around an object being examined and is picked up by sensitive radiation detectors after having ...
Computed tomography (CT) and positron emission tomography (PET) scans are similar to MRI, but rely on different imaging techniques (X-rays and ionizing radiation, respectively). A variation of CT known as contrast CT also requires the subject to take in a contrast medium called a radiocontrast (typically by oral consumption, enema, or injection ...
Cover of the first edition. Biology Today is a college-level biology textbook that went through three editions in 1972, 1975, and 1980. The first edition, published by Communications Research Machines, Inc. (CRM) and written by a small editorial team and large set of prominent "contributing consultants", is notable for its lavish illustrations and its humanistic approach.
In conventional CT machines, an X-ray tube and detector are physically rotated behind a circular shroud (see the image above right). An alternative, short lived design, known as electron beam tomography (EBT), used electromagnetic deflection of an electron beam within a very large conical X-ray tube and a stationary array of detectors to achieve very high temporal resolution, for imaging of ...
Medical optical imaging is the use of light as an investigational imaging technique for medical applications, pioneered by American Physical Chemist Britton Chance.Examples include optical microscopy, spectroscopy, endoscopy, scanning laser ophthalmoscopy, laser Doppler imaging, optical coherence tomography, and transdermal optical imaging.
Computed tomography or CT scan (previously known as CAT scan, the "A" standing for "axial") uses ionizing radiation (x-ray radiation) in conjunction with a computer to create images of both soft and hard tissues. These images look as though the patient was sliced like bread (thus, "tomography" – "tomo" means "slice").