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Impact of computers in radiography: The advent of digital radiography, Part-2.

Verma B, Indrajit I - Indian J Radiol Imaging (2008)

View Article: PubMed Central - PubMed

Affiliation: Department of Radiodiagnosis and Imaging, Army Hospital (Research and Referral), Delhi Cantt. - 110 010, India.

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Advantages and limitations of film screen radiography (FSR), digital radiography systems in general and CR systems in particular were also listed in a tabular form... Direct digital radiography (DR) systems, on the other hand, use detectors that have a combined image capture and image read out capability... To improve workflow and to avoid the use of cassettes, a new class of detectors was manufactured that combined the processes of image capture and image read-out... There are two types of flat panel detectors depending on the method and material used for the conversion of x-rays into electrical signals: (i) Direct X-ray conversion type that uses a photoconductor and (ii) Indirect X-ray conversion type with a photoscintillator/ phosphor screen... This prevents scatter radiation from reaching the detector... Thus use of a radiographic grid is not necessary, significantly reducing the radiation dose... Alternatively the image data can be transferred to DR console via an Ethernet cable... It has no cables and does not interfere with surrounding machines... Some of the drawbacks of CR systems, namely cassette handling, long read out time of PSP plates, low DQE and poor resolution have been addressed by newer innovations and technological advances... CR systems efficiency has been recently improved by reducing the read out time and by removing the step of cassette handling... The process consists of the following key steps: (a) entering patient information into the register/console, (b) setting exposure parameters, (c) getting and positioning the radiographic cassette, (d) positioning the patient, (e) radiographic exposure, (f) film processing, (g) cassette reloading, and (h) image quality check before the patient goes away... It is evident from above that a technological move from FSR to CR does not eliminate or reduce the duration of any of the described steps... By their tremendous impact on the image quality and the workflow, digital radiography systems have become practicable alternatives... The current scenario in CR and DR is one of relentless technological advancement and expansion... CR systems now have features that traditionally had been associated with DR.

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Flat panel detector assembly consisting of (A) an X-Ray converter, which is either a photoscintillator or a photoconductor; (B) TFT matrix and (C) glass substrate
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Figure 0001: Flat panel detector assembly consisting of (A) an X-Ray converter, which is either a photoscintillator or a photoconductor; (B) TFT matrix and (C) glass substrate

Mentions: FPD based DR systems are the most popular. In these, thin film transistor (TFT) arrays are used, which are made of amorphous silicon (a-Si). Silicon semiconductor sheets are etched with square detector elements, 70-200 µm on each side, on a glass substrate [Figure 1]. Each element has a capacitor and a switching transistor. Gait and drain lines are connected to each transistor and capacitor, enabling active readout of charges from each detector element separately. x-ray converter material is layered on the TFT matrix to make a flat panel detector.


Impact of computers in radiography: The advent of digital radiography, Part-2.

Verma B, Indrajit I - Indian J Radiol Imaging (2008)

Flat panel detector assembly consisting of (A) an X-Ray converter, which is either a photoscintillator or a photoconductor; (B) TFT matrix and (C) glass substrate
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2747436&req=5

Figure 0001: Flat panel detector assembly consisting of (A) an X-Ray converter, which is either a photoscintillator or a photoconductor; (B) TFT matrix and (C) glass substrate
Mentions: FPD based DR systems are the most popular. In these, thin film transistor (TFT) arrays are used, which are made of amorphous silicon (a-Si). Silicon semiconductor sheets are etched with square detector elements, 70-200 µm on each side, on a glass substrate [Figure 1]. Each element has a capacitor and a switching transistor. Gait and drain lines are connected to each transistor and capacitor, enabling active readout of charges from each detector element separately. x-ray converter material is layered on the TFT matrix to make a flat panel detector.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiodiagnosis and Imaging, Army Hospital (Research and Referral), Delhi Cantt. - 110 010, India.

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Advantages and limitations of film screen radiography (FSR), digital radiography systems in general and CR systems in particular were also listed in a tabular form... Direct digital radiography (DR) systems, on the other hand, use detectors that have a combined image capture and image read out capability... To improve workflow and to avoid the use of cassettes, a new class of detectors was manufactured that combined the processes of image capture and image read-out... There are two types of flat panel detectors depending on the method and material used for the conversion of x-rays into electrical signals: (i) Direct X-ray conversion type that uses a photoconductor and (ii) Indirect X-ray conversion type with a photoscintillator/ phosphor screen... This prevents scatter radiation from reaching the detector... Thus use of a radiographic grid is not necessary, significantly reducing the radiation dose... Alternatively the image data can be transferred to DR console via an Ethernet cable... It has no cables and does not interfere with surrounding machines... Some of the drawbacks of CR systems, namely cassette handling, long read out time of PSP plates, low DQE and poor resolution have been addressed by newer innovations and technological advances... CR systems efficiency has been recently improved by reducing the read out time and by removing the step of cassette handling... The process consists of the following key steps: (a) entering patient information into the register/console, (b) setting exposure parameters, (c) getting and positioning the radiographic cassette, (d) positioning the patient, (e) radiographic exposure, (f) film processing, (g) cassette reloading, and (h) image quality check before the patient goes away... It is evident from above that a technological move from FSR to CR does not eliminate or reduce the duration of any of the described steps... By their tremendous impact on the image quality and the workflow, digital radiography systems have become practicable alternatives... The current scenario in CR and DR is one of relentless technological advancement and expansion... CR systems now have features that traditionally had been associated with DR.

No MeSH data available.