Measurement of the detective quantum efficiency (DQE) of digital x-ray imaging devices according to the standard IEC 62220-1

Illers, Hartmut; Buhr, E.; Bergmann, Detlef; Hoeschen, Christoph

doi:10.1117/12.535999

Cited by 26 publications

(17 citation statements)

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“…In conclusion, dose reduction in flat panel detector radiography is possible in some extent regardless of the clinical situation and question. Technically, flat panel detectors have a two to three times higher quantum absorption (detective quantum efficiency, DQE) compared to conventional digital detectors like powder screen storage phosphors [8]. Therefore less dose proportional to the higher DQE is needed for equal image quality, or image quality can be improved when the same dose is applied to these detectors.…”

Section: Discussionmentioning

confidence: 99%

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Initial Clinical Results with a New Needle Screen Storage Phosphor System in Chest Radiograms

Körner¹,

Wirth²,

Treitl³

et al. 2005

Rofo Fortschr Geb Rontgenstr N

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Section: Discussionmentioning

confidence: 99%

“…The system was operated at a nominal pixel size of 114 µm, the dynamic resolution was 12 bit, with a system characteristics proportional to the square root of the exposure dose. The performance in terms of detective quantum efficiency (DQE) of a comparable system was published by Illers et al [8].…”

Section: Patientsmentioning

confidence: 97%

Initial Clinical Results with a New Needle Screen Storage Phosphor System in Chest Radiograms

Körner¹,

Wirth²,

Treitl³

et al. 2005

Rofo Fortschr Geb Rontgenstr N

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“…However the detector noise is getting more important [11] for lower doses. This would mean that the amount of dose which can be saved is smaller.…”

Section: Discussionmentioning

confidence: 99%

Testing a wavelet based noise reduction method using computer-simulated mammograms

Hoeschen

Tischenko

Dance

et al. 2005

Medical Imaging 2005: Physics of Medical Imaging

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A wavelet based method of noise reduction has been tested for mammography using computer-simulated images for which the truth is known exactly. This method is based on comparing two images at different scales, using a crosscorrelation-function as a measure of similarity to define the image modifications in the wavelet domain. The computersimulated images were calculated for noise-free primary radiation using a quasi-realistic voxel phantom. Two images corresponding to slightly different geometry were produced. Gaussian noise was added with a mean value of zero and a standard deviation equal to 0.25% to 10% of the actual pixel value to simulate quantum noise with a certain level. The added noise could be reduced by more than 70% using the proposed method without any noticeable corruption of the structures for 4% added noise. The results indicate that it is possible to save 50% dose in mammography by producing two images (each 25% of the dose for a standard mammogram). Additionally, a reduction or even a removal of the anatomical noise might be possible and therefore better detection rates of breast cancer in mammography might be achievable.

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“…For the beam qualities, we used a filter set and settings according to the IEC 1267 and IEC 62220 standards [8,9]. With this method we were able to reproduce the DQE values measured for an ADC system according to the standard by Illers et al [7], within a measurement uncertainty of ±0.012 (absolute DQE values) over the frequency range of 0.5 lp/mm to 4 lp/mm. The DQE and MTF were determined at doses of approx.…”

Section: Phosphor Layer Thickness In µMmentioning

confidence: 98%

“…The emitted photo stimulated light is collected via light collection optics and detected in a photodetector. The combination of a needle-structured image plate with the ScanHead technology creates a new CR device that can compete with the best DR systems in image quality and clinical work flow [6,7]. An image quality improvement not only gives the radiologist more diagnostic confidence, it also offers the possibility to reduce patient dose.…”

Section: Introductionmentioning

confidence: 98%

Reflective and transmissive CR ScanHead technology on needle image plates

Frankenberger

Mair

Herrmann

et al. 2005

Medical Imaging 2005: Physics of Medical Imaging

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The image quality of needle-image-plate (NIP) Computed Radiography (CR) scanners based on ScanHead technology was optimized. In order to get the best image quality for different applications, the influence of the phosphor layer thickness on the detective quantum efficiency (DQE) for different beam qualities was investigated. We compared a cassette-based, reflective CR-NIP-scanner to a new, transmissive flat-panel CR scanner with fixed, mounted NIP. The image quality was analyzed by DQE-and modulation transfer function (MTF) measurements supported by an observer study. The NIP systems reached DQE values up to three times higher than that of high-quality, state of the art CR scanners independent of the scanning principle. This allows a dose reduction by a factor of two to three without loss of image quality for both scanning systems. For high tube voltages, the variation of the phosphor layer thickness results in a DQE maximum at relatively large thicknesses. For lower tube voltages the DQE is less dependent on the layer thickness, reaching excellent values already at considerably lower thicknesses. Consequently, CR scanners can be adapted to different applications by using NIPs with different thicknesses. This could be easily realized for the cassette based system, but not for the flat-panel system with fixed IP. The latter demands a compromise with respect to the phosphor thickness, to yield superior image quality for all applications.

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Measurement of the detective quantum efficiency (DQE) of digital x-ray imaging devices according to the standard IEC 62220-1

Cited by 26 publications

References 0 publications

Initial Clinical Results with a New Needle Screen Storage Phosphor System in Chest Radiograms

Initial Clinical Results with a New Needle Screen Storage Phosphor System in Chest Radiograms

Testing a wavelet based noise reduction method using computer-simulated mammograms

Reflective and transmissive CR ScanHead technology on needle image plates

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