- Formation of a Digital Image: The Imaging Chain Simplified - Semantic Scholar
- Modern Fluoroscopy Imaging Systems
- Arlem Bráz
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Formation of a Digital Image: The Imaging Chain Simplified discusses the process that creates digital images for people who don't want to be blinded with equations and bored with geek speak. This book is written for individuals who work with camera designers and want to know but are sometimes afraid to ask why they keep babbling about an MTF or some other mysterious acronym.
Formation of a Digital Image: The Imaging Chain Simplified - Semantic Scholar
If you ever wonder why pinstripe suits turn psychedelic on TV or why crosses appear on pictures of stars, I hope you will find this book helpful, and I apologize in advance for sometimes getting too close to geek speak. Habits are very hard to break. If nothing else, this book has photos of puppies that you will hopefully enjoy. Sign In View Cart 0 Help. Share Email Print. Sample Pages.
Modern Fluoroscopy Imaging Systems
Ultrasound and nuclear medicine were easy converts to the digital world early on because the images created in these modalities were simply frame-grabbed the current image on the screen is captured and sent as an image file and converted to a digital image. The concept of moving images digitally was introduced by Albert Jutras in Canada during his experimentation with teleradiology moving images via telephone lines to and from remote locations in the s.
To provide the PACS a digital image, early analog radiographs were scanned into a computer digitized so that the images could be sent from computer to computer. The inherently digital modalities were sent via a PACS first, and then as projection radiography technologies advanced, they joined the digital ranks.
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Photostimulable phosphor PSP image capture previously known as computed radiography [CR] , is the digital acquisition modality that uses storage phosphor plates to produce projection images. To avoid possible confusion resulting from use of the term computed , the technology related to this type of system will be referred to as PSP because the newer systems may or may not be cassette based. The only new equipment that is required is the PSP and phosphor plates, the PSP readers, the technologist quality control workstation, and a means to view the images, which can be either a printer or a viewing station Figure The storage phosphor plates are similar to our current intensifying screens.
The biggest difference is that the storage phosphors can store a portion of the incident x-ray energy in traps within the material for later readout. More is presented on this topic in Chapter 4.
The first system consisted of a phosphor storage plate, a reader, and a laser printer to print the image onto film. PSP imaging did not take off very quickly because many radiologists were reluctant to embrace the new technology.
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In the early s, PSP imaging began to be installed at a faster rate because of the technological improvements that had occurred in the decade since its introduction. Most flat panel detector FPD systems use an x-ray absorber material coupled to a thin film transistor or a charge-coupled device CCD to form the image. FPD can be divided into two categories: indirect capture and direct capture.
Indirect capture digital radiography devices absorb x-rays and convert them into light.
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The light is then collected by an area-CCD or thin-film transistor TFT array and then converted into an electrical signal that is sent to the computer for processing and viewing Figure Direct capture digital radiography devices convert the incident x-ray energy directly into an electrical signal, typically using a photoconductor as the x-ray absorber, and send the electrical signal to a TFT and then to an ADC. The ADC signal goes to the computer for processing and viewing Figure Choudhri, Frederick A. Boop, and James W. Mathew and Lawrence D.
Kadam and Michael V. Nordli, Jr. Ferrie, and Chrysostomos P. Search Engine. Average : rate 1 star rate 2 star rate 3 star rate 4 star rate 5 star Your rating: none, Average: 0 0 votes. Chapter 1.
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Photograph taken at Roentgen Museum, Lennep, Germany. A, A high-volume reader capable of processing between and imaging plates per hour. B, A much smaller system designed for medical offices, surgery, or intensive care units, capable of processing 50 to 60 imaging plates per hour. Image courtesy of Siemens Healthcare.
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