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Parametric Image

About: Parametric Image is a research topic. Over the lifetime, 311 publications have been published within this topic receiving 6095 citations.


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Proceedings ArticleDOI
03 Nov 1994
TL;DR: The aim of this work is to propose an efficient algorithm, based on Newton-Raphson principle, which reduces calculation time by three in comparison with the traditional Newton- Raphson one.
Abstract: The calculation of accurate T1 parametric image is performed by collecting a series of spin-echo images with different T1 weightings (variable repetition times) This relaxation time must be estimated by non-linear fitting for each pixel The aim of this work is to propose an efficient algorithm, based on Newton-Raphson principle, which reduces calculation time by three in comparison with the traditional Newton-Raphson one >
Patent
05 Jul 2018
TL;DR: In this paper, a color map is formed of the time-dependent data or the polarities of the data and displayed in a parametric image as a color overlay of a contrast image of the liver.
Abstract: An ultrasonic diagnostic imaging system and method acquire a sequence of image data as a bolus of contrast agent washes into and out of the liver. The image data of contrast intensity is used to compute time-intensity curves of contrast flow for points in an ultrasound image. Time-dependent data is calculated from the data of the time-intensity curves which, in a described implementation, comprise first and second derivatives of the time-intensity curves. A color map is formed of the time-dependent data or the polarities of the data and displayed in a parametric image as a color overlay of a contrast image of the liver.
Patent
17 Jun 2005
TL;DR: In this paper, a system and method could be configured to receive an image to be displayed upon a user interface of the device and one or more indicators can be used to specify how the image is to be divided into multiple regions.
Abstract: Systems and methods for use in displaying user interface components upon user interfaces of computing devices. A system and method could be configured to receive an image to be displayed upon a user interface of the device. One or more indicators can be used to specify how the image is to be divided into multiple regions. The regions of the divided image are displayed with a user interface component upon the user interface of the device.
Proceedings ArticleDOI
01 Oct 2016
TL;DR: In this article, variable contributions to TOF variance reduction between true and random events, owing to their spatial distribution, results in SNR improvements depending on the random fraction and leading to variable TOF gains amongst temporal frames within a dynamic study.
Abstract: Dynamic PET imaging allows the time course of the activity distribution to be measured and modelled, therefore estimating parametric images of micro- or macro-parameters. Due to the need for increased temporal sampling, frames of low statistics are often reconstructed, leading to noisy dynamic data and subsequently to kinetic parameters of reduced precision and accuracy. TOF image reconstruction can substantially improve upon the kinetic parameter SNR. However, variable contributions to TOF variance reduction between true and random events, owing to their spatial distribution, results in SNR improvements depending on the random fraction and leading to variable TOF gains amongst temporal frames within a dynamic study. Such variable gains between early/late frames (high/low random fractions) are also expected to be more pronounced at increasing injected doses. Therefore, we hypothesize that certain kinetic parameters receive differential improvements depending upon the part of the time-activity curve they are estimated from. Using simulated dynamic [15O]H 2 O datasets at ever increasing doses and random fractions, we investigate the variable TOF gain in dynamic imaging and its effect on the kinetic parameters. Data are presented at improving TOF resolutions and using both indirect and direct methods to kinetic parameter estimation. Initial results suggest that kinetic parameter TOF gain is highly variable (increasing) at ever increasing injected doses, but such variation is different for each parameter based on the part of the dynamic data it is derived from, owing to the variable TOF gain within dynamic frames.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20217
202013
201911
20186
201713
201613