摘要:
A grid assembly for use with an imaging cassette. The grid assembly includes an anti-scatter grid having a length and opposing first and second ends; first and second transport members disposed proximate the first and second ends, respectively, of the grid; at least one first roller disposed at the first end of the grid; at least one second roller disposed at the second end of the grid; and a pair of support members disposed substantially perpendicular to the length and proximate the opposing ends of the grid in spaced relationship to form a slot having an opening proximate one side of the grid adapted to removably slidably receive the imaging cassette adjacent the grid.
摘要:
A grid assembly for use with an imaging cassette, for example, a computed radiography cassette, particularly an elongated radiography cassette. The grid assembly includes: an anti-scatter grid; a radiographically translucent enclosure housing the anti-scatter grid and having two ends; a transport member disposed proximate a first end of the enclosure; at least one roller disposed proximate a second end of the enclosure; and a receiving member attached to the enclosure and adapted to removably receive and secure the imaging cassette.
摘要:
A method of forming a composite image from first and second digital images formed by recording first and second contiguous segments of a larger radiographic image in first and second overlapping storage phosphor members, exposed to a source of X-rays wherein the image content in the overlapped region is the same in both images and the end edge of the first member is present both on the first image and as a shadow edge in the second image, the method comprising: correcting for geometric distortion in the first and second digital images; determining any rotational displacement and any vertical displacement between the first and second images by matching the first member end edge in the first image to its shadow in the second image; correcting for image orientation based on any said rotational displacement; determining any horizontal displacement between the first and second images by correlating the image content in the overlapped region of the first and second images; and stitching said first and second images together along the first member end edge based on any said horizontal and vertical displacements.
摘要:
A method of and system for the 3-D reconstruction of an image from 2-D cone-beam tomography projections is disclosed in which a circle-plus-arc data acquisition geometry is utilized to provide a complete set of data so that an exact 3-D reconstruction is obtained. A volume CT scanner which uses a cone-beam x-ray source and a 2-D detector is utilized in which one set of cone-beam projections is acquired while rotating the x-ray tube and detector on the CT gantry and then another set of projections is acquired while tilting the gantry by a small angle. The projection data is preweighted and the partial derivatives of the preweighted projection data are calculated. Those calculated partial derivatives are rebinned to the first derivative of the Radon transform, for both the circular orbit data and the arc orbit data. The second partial derivative of the Radon transform is then calculated and then the reconstructed 3-D images are obtained by backprojecting using the inverse Radon transform.
摘要:
A method for obtaining a digital chest x-ray image of a patient. The method includes providing a default set of technique settings for the chest x-ray, wherein the default set is selectable by an operator command and includes using a peak kilovoltage exposure setting that is below 90 kVp with beam filtration of the x-ray, and applying a rib contrast suppression algorithm to the digital chest x-ray image data acquired from the exposure.
摘要:
A radiography system for obtaining a radiographic image of a subject, has a radiation source within an enclosure, the radiation source energizable to direct radiant energy along a radiation path toward an imaging receiver, wherein the radiation path is defined according to a collimator. A digital projector is coupled to the enclosure and is energizable to provide an illumination beam that outlines the defined radiation path.
摘要:
The invention provides a method for detecting a target nucleotide sequence by tagging the nucleotide sequence with a nucleotide tag, providing a probe oligonucleotide with a melting temperature Tm1, comprising a regulatory sequence and a nucleotide tag recognition sequence; incorporating the probe oligonucleotide into the tagged polynucleotide in a polynucleotide amplification reaction, providing a regulatory oligonucleotide with a melting temperature Tm2, comprising a sequence segment that is at least partially complementary to the regulatory sequence, amplifying the tagged target nucleic acid sequence in a PCR amplification reaction using the probe oligonucleotide as a primer, and detecting the amplification product; wherein Tm1 and Tm2 are higher than the annealing temperature associated with the polynucleotide amplification reaction.
摘要:
A method is disclosed for acquiring a high speed dual-energy image pair using a pixilated digital detector. A single pixilated digital detector acquires and encodes two separate images in effectively one image, eliminating the need to read out a first image prior to acquiring a second image. The encoded information is then utilized to obtain two distinct dual-energy images which may be decomposed to form bone and soft-tissue only images.
摘要:
A display controller including a pixel processor which processes working pixel data for each pixel of a frame, and which includes an overlap detector, a collision detector, and a construction processor. The overlap detector detects an overlap when any new pixel value of a new update region is within a region of a current update of the frame. The collision detector issues a correction request when at least one pixel within the overlap region has a begin pixel value prior to the current update that is different from an end pixel value provided by the current update, and when a new pixel value provided by the new update for the pixel is different from the end pixel value. The construction processor updates the working pixel data before the current update is completed using a new pixel value for each non-overlapping pixel.
摘要:
Outer-loop power control methods and apparatus are disclosed. In an exemplary embodiment, a short-term block error rate is measured for a received signal, and a coarse adjustment to a target signal-to-interference ratio (SIR) is calculated as a function of the short-term block error rate, a target block error rate, and a first loop tuning parameter. In some embodiments, a fine adjustment to the target SIR is also calculated, as a function of a smoothed block error rate, the target block error rate, and a second loop tuning parameter. The coarse adjustment provides quick responsiveness to received block errors, while the fine adjustment moderates the coarse adjustments by accounting for a longer-term view of the received block error rate. The target SIR adjustments disclosed herein may be computed in each of several iterations of an outer-loop power control loop.