The Equivalent Quantum Efficiency of the Photographic Process

Shaw, Rodney

doi:10.1080/00223638.1963.11736919

Cited by 95 publications

(76 citation statements)

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“…This result is proportional to the logarithm of the ratio of signal 'power' to noise 'power' in that channel. In the small signal limit the logarithmic measure is simply proportional to the SNR 2 in the channel (Shaw 1963, here written as We see that the NEQ(f) approach and the Shannon channel approach lead to the same measure (Shaw 1963). (Shaw (1978) points out that Shannon's approach to the quantification of information in noisy communications channels is actually more general than the thermodynamics it resembles since it is applicable to problems involving any kind of uncertainty.)…”

Section: The Snr(f) Spectrum and The Concept Of The Aperturementioning

confidence: 99%

Unified SNR analysis of medical imaging systems

1985

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The ideal observer signal to noise ratio (SNR) has been derived from statistical decision theory for all of the major medical imaging modalities. This SNR provides an absolute scale for image system performance assessment and leads to instrumentation design goals and constraints for imaging system optimisation since no observer can surpass the performance of the ideal observer. The dependence of detectable detail size on exposure or imaging time follows immediately from the analysis. A framework emerges for comparing data acquisition techniques, e.g. reconstruction from projections versus Fourier methods in NMR imaging, and time of flight positron emission tomography (TOFPET) versus conventional PET. The approach of studying the ideal observer is motivated by measurements on human observers which show that they can come close to the performance of the idea) observer, except when the image noise has negative correlations-as in images reconstructed from projections-where they suffer a small but significant penalty.

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Section: The Snr(f) Spectrum and The Concept Of The Aperturementioning

confidence: 99%

Unified SNR analysis of medical imaging systems

1985

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“…As an alternative to the NPS, the NEQ describes image noise in terms of a number of Poisson-distributed input photons per unit area as a function of spatial frequency [52], [53], [54]. While the NEQ concept expresses image quality on an absolute scale that is independent of specific system parameters, it has great importance as it also describes what can and cannot be seen in a noise-limited image as described by the detectability index [55].…”

Section: A Fourier-based Metrics Describing Signal and Noise Performmentioning

confidence: 99%

Fourier Analysis of Noise Characteristics in Cone-Beam Microtomography Laboratory Scanners

Jang¹,

Kim

Youn³

et al. 2017

IEEE Trans. Biomed. Eng.

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“…This formalism was extended to new image quality assessment concepts that were introduced in the context of photographic imaging, such as detective quantum efficiency (DQE), which is a measure of the collective effects of the signal (associated with image contrast) and noise performance of an imaging system, usually expressed as a function of spatial frequency ω [21,71]:…”

Section: Signal Versus Noisementioning

confidence: 99%

Advances in Technological Design to Optimize Exposure and Improve Image Quality

Gutiérrez

Zaidi

2013

Radiological Safety and Quality

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Multimodality imaging is playing a key role in the clinical management of patients in routine diagnosis, staging, restaging and assessment of response to treatment, surgery and radiation therapy planning of malignant diseases. The complementarity between anatomical (CT and MRI) and functional/molecular (SPECT and PET) imaging modalities is now well recognized and the role of fusion imaging is widely used as a central piece of the general tree of clinical decision making. Moreover, dual-modality imaging technologies including SPECT/CT, PET/CT and nowadays PET/MR represent the leading component of a modern healthcare facility. There have been significant advances in data acquisition along with innovative approaches to image reconstruction and processing with the aim to improve image quality and diagnostic information. However, CT procedures involve relatively high doses to the patient, which triggered many initiatives to reduce the delivered dose particularly in paediatric practice.This chapter discusses the state-of-the-art developments and challenges of multimodality medical imaging technologies and dose reduction strategies. Future opportunities and the challenges limiting their adoption in clinical and research settings will also be addressed.

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The Equivalent Quantum Efficiency of the Photographic Process

Cited by 95 publications

References 1 publication

Unified SNR analysis of medical imaging systems

Unified SNR analysis of medical imaging systems

Fourier Analysis of Noise Characteristics in Cone-Beam Microtomography Laboratory Scanners

Advances in Technological Design to Optimize Exposure and Improve Image Quality

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