Physics • How Radiology Works

Digital X-ray Imaging [Dels, Matrix Size, Bit Depth , Dynamic Range, Sampling Frequency]

The basic concepts of digital x-ray detectors are covered including the important concepts. Digital detectors are separated into small individual components termed detector elements (DELs), and the size of individual DELs is referred to as the pixel pitch. Whereas the matrix size is the number of DELs in each direction on the detector. The signal […]

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What Radiologic Technologists must know about Radiation Dose Units (mGy, mSv).

Physics, Dose

Introduction As a radiologic technologist one of your primary responsibilities is to get X-rays images with satisfactory image quality at a radiation dose that is As Low as Reasonably Achievable (ALARA). With this in mind, you must have a good understanding of the basis concepts in radiation dose measurements and the units for measuring radiation

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X-ray Generation, pictorial Guide [Bremsstrahlung, Characteristic]

Physics, CT, X-Ray

X-ray tubes used in diagnostic X-ray exams all use the same physical principles including: thermionic emission (boiling off electrons), accelerating electrons by a kiloVoltage potential (kVp), and two physical interactions contribute to x-ray generation: bremstraalung (braking radiation), and characteristic radiation (peaks in energy spectrum). The output x-ray distribution as a function of energy is termed

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Animated CT Generations [1st, 2nd, 3rd, 4th, 5th Gen CT] for Radiologic Technologists

Physics, CT

CT scanning prototypes were developed in the late 1960s and this post describes the stages of technological development for CT scanners (Generations 1-5). After demonstrating the differences between these generations of scanner we describe how the 3rd generation became the dominant architecture and discuss the common projection geometries of parallel beam, fan beam and cone

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