Brian Nett, PhD

Educator, How Radiology Works ; Principal Scientist, GE Healthcare ; Adjunct Assistant Professor, University of Wisconsin Madison.

radiography History 400

History of X-Ray Imaging

By Brian Nett, PhD / History Highlights of X-ray radiology from the discovery of x-rays through its multiple uses including: radiography, fluoroscopy, mammography, cardiac catherization, digital subtraction angiography, and bone densitometry.

radiologyHistory 400

History Radiology

Illustrated History of Radiology (X-Ray, CT, PET, MRI, Ultrasound) By Brian Nett, PhD / History In this post we present a brief history of Radiology equipment focusing on the major developments which lead to x-ray Radiography, CT, SPECT, PET and Ultrasound imaging.

FeaturedImage FBP

Filtered BackProjection (FBP) Illustrated Guide for Radiologic Technologists

The Filtered BackProjection (FBP) algorithm is the basis for image reconstruction (converting from the measured data to the image) on modern CT scanners. FBP is a fast and direct method to generate CT images. As the name suggests it is composed of two main steps filtering the data (along the row direction in the detector) …

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radTech Newbies 400

X-ray physics intro for starting x-ray school, a step by step guide for new radiologic technologists (radiographers).

If you are a student in training or totally new to x-ray physics are you feeling: overwhelmed or confused with the all the terminology and physics concepts pressured or embarrassed that you don’t know the answers to questions from senior technologists during your clinicals unsure of radiation effects and nervous about mass media coverage you …

X-ray physics intro for starting x-ray school, a step by step guide for new radiologic technologists (radiographers). Read More »

X rayTechParameters

X-Ray Tech Exposure Calculator, 5 Simple relationships that guide Technical Parameters In X-Ray Imaging

An interactive calculator for changing multiple technical parameters (kVp, SID, s, Bucky Factor) in and observing the effect on the mA needed to keep the exposure on the image receptor constant. Great for studying for your ARRT boards or brushing up to sharpening your technical parameter skills for Radiography exams. X-Ray Exposure Calculator Overview of …

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ctScanModes 400

Illustrated comparison of CT Scan Modes [axial, helical, wide-cone axial, low pitch, high pitch] for Radiologic Technologists

CT (Computed Tomography) scanning can be accomplished with multiple different scan modes which have different characteristics. Axial non-volumetric scanning is how CT began where one (or just a few) slices are acquired during each gantry rotation. Traditional helical scanning (some call spiral) has the advantage of being faster than non volumetric axial scanning and also …

Illustrated comparison of CT Scan Modes [axial, helical, wide-cone axial, low pitch, high pitch] for Radiologic Technologists Read More »

let rbe oer 400

LET, RBE and OER (Oh My!). Radiologic Technologists Guide to 3 Radiation Biology Terms.

LET (Linear Energy Transfer), RBE (Relative Biological Effectiveness) and OER (Oxygen Enhancement Ratio) are important terms in radiation biology and relate to the relative damage that will occur with radiation under different circumstances. As LET increases there are more energetic electrons deposited closely together and thus damage to DNA is more likely. Therefore, even with …

LET, RBE and OER (Oh My!). Radiologic Technologists Guide to 3 Radiation Biology Terms. Read More »

acute vs chronic

Acute vs Chronic, tissue sensitivities to radiation and [4 cell damage pathways] for Radiologic Technologists

Radiation damage can be either acute or chronic depending on the conditions. Acute radiation effects are due to short exposures to radiation at a relatively high dose rates and the impact is observed within days or weeks (examples include acute radiation syndromes). Whereas chronic radiation effects are typically associated with lower doses and the effects …

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radiationCancer 400

Radiation Carcinogenesis [Radiation Biology, Somatic effects] for Radiologic Technologists

Radiation Carcinogenesis In this post we will describe the stochastic effect of radiation carcinogenesis (a fancy way of saying a higher risk of cancer induction after being exposed to ionizing radiation). The mechanism for carcinogenesis is primarily x-rays coming in, generating energetic electrons which then either directly or indirectly cause DNA damage. The data which …

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