Brian Nett, PhD

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

digitalDetectorsDR 400

Digital Radiography (Direct vs Indirect Flat panels)

Digital radiography detectors are used to directly acquire x-ray images in place of film or computed radiography (CR) systems and are separated into direct and indirect detectors. Direct detectors convert from the x-rays electrons (that are measured), whereas indirect detector convert from x-rays to visible light first and then to electrons (that are measured). Digital …

Digital Radiography (Direct vs Indirect Flat panels) Read More »

repeatScanning 400

Should previous CT dose influence prescribing an exam? [guide for radiologic technologists, also for x-ray and nuc med]

Is the risk of developing cancer from radiation dependent on previous radiation dose? In order to answer the question, “Should previous CT dose influence a given exam?” we need to understand if there are cumulative effects of being exposed to radiation that will change the relative risk for subsequent exams. For each patient that is …

Should previous CT dose influence prescribing an exam? [guide for radiologic technologists, also for x-ray and nuc med] Read More »

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) …

Filtered BackProjection (FBP) Illustrated Guide for Radiologic Technologists Read More »

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 …

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

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 »

Scroll to Top