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GE Healthcare Discovery CT750 HD 64-Slice (2010)

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GE Healthcare Discovery CT750 HD 64-Slice (2010)

GE HealthCare Medical Diagnostic Equipment

Refurbished

GE Healthcare Discovery CT750 HD 64-Slice (2010)

Product Code: MDIE-MIEQ-2845

Two energy spectra in one rotation, half a millisecond apart.

Dual-energy imaging asks what a material is, not only how densely it attenuates. Gemstone Spectral Imaging switches the tube between 80 and 140 kV at intervals under half a millisecond during a single rotation, so both spectra sample the same anatomy at effectively the same instant. This scanner was built in 2010 and is listed on Medigear.uk for UK business buyers.

Sections

CT Scanner

Categories

Medical Diagnostic Equipment

Condition

Refurbished

Year

2010

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

A conventional CT number tells you how strongly a voxel attenuated the beam, and that single figure can be produced by different materials at different concentrations. Iodine at one concentration and calcium at another can occupy the same Hounsfield value, which is why a bright focus is sometimes ambiguous.

Attenuation varies with photon energy, and it varies differently for different materials, so measuring the same voxel at two energies separates them. The difficulty has always been acquiring both measurements of the same tissue at the same moment.

Gemstone Spectral Imaging does that from one source. The tube switches between 80 and 140 kV at intervals under half a millisecond during a single gantry rotation, so high and low energy views are interleaved through the acquisition and register to each other temporally. Because the pairs are captured almost simultaneously, decomposition is performed on the projection data before reconstruction rather than on finished images, and the material decomposition field of view extends across the full 50 cm.

Two design elements make that possible. The generator must switch cleanly at that rate, with the rise and fall incorporated into the view measurements and residual non-idealities handled in spectral calibration. The detector must respond fast enough to distinguish consecutive views at different energies, which is the role of the Gemstone cerium-activated garnet composite scintillator paired with fast-sampling data acquisition. Tube current stays constant across both energies, with the exposure time divided between them to balance the contrast-to-noise ratio, typically weighted towards the lower energy where output is lower.

What comes out is a set of datasets rather than a single image. Monochromatic images are synthesised at selectable energies, which changes iodine conspicuity and beam-hardening behaviour across the energy range. Material density images are produced in basis pairs such as water and iodine or water and calcium, so contrast can be quantified or removed. Effective atomic number maps support tissue characterisation. From those follow virtual non-contrast imaging, iodine quantification and reduction of artefact around metal.

Adaptive Statistical Iterative Reconstruction is available on the same platform, modelling noise statistically during image formation to support acquisition at lower tube current, subject to the licence on the unit.

Beneath the spectral capability sits a 64-slice scanner for routine work, so the system covers a general list alongside the studies that call for material separation.

Diagnostic interpretation remains with the reporting radiologist, and exposure decisions with the operator under the employer's dose framework. The software release, GSI and ASiR licences, tube type and condition, rotation times and application set are provided by the seller at quotation, with CE marking documentation, the declaration of conformity, a decontamination certificate and warranty terms issued by the manufacturer or held by the seller.

Oncological characterisation is supported by material density imaging and effective atomic number mapping, which address what a lesion is made of alongside how it attenuates.

Contrast quantification is available through iodine basis images, allowing enhancement to be measured rather than estimated visually.

Virtual non-contrast imaging removes iodine computationally from a contrast-enhanced acquisition, so a comparison dataset is available from a single scan.

Urinary stone assessment draws on material separation, since composition bears on management and on how a stone responds to treatment.

Imaging around metal implants is supported by monochromatic reconstruction at higher energies together with artefact reduction, in patients where hardware obscures the region of interest.

Neurological and vascular work benefits from selectable monochromatic energy, since iodine conspicuity and beam-hardening behaviour both change across the energy range.

Routine head, chest, abdominal and musculoskeletal computed tomography runs on the underlying 64-slice platform alongside the spectral studies.

Both Energies From One Source

A single tube switches between 80 and 140 kV, so there is no second tube or second detector array in the gantry to align.

Sub-Millisecond Switching

Views alternate at intervals under half a millisecond, so high and low energy measurements describe the same anatomy at effectively the same instant.

Decomposition Before Reconstruction

Because the pairs register temporally, material decomposition is performed on the projection data as it was measured.

Material Separation Across the Full Field

The material decomposition scan field of view extends to 50 cm, so separation is available across the whole imaged area.

Images at a Chosen Energy

Monochromatic reconstruction produces images at selectable energies, changing iodine conspicuity and beam-hardening behaviour to suit the question.

Contrast Measured, Not Estimated

Iodine basis images allow enhancement to be quantified rather than judged by eye.

A Non-Contrast Dataset From a Contrast Scan

Virtual non-contrast imaging derives an unenhanced comparison from the same acquisition.

A Detector Built for the Switching Rate

The cerium-activated garnet composite scintillator responds fast enough for consecutive views at different energies to be separated cleanly.

Exposure Balanced Across the Two Energies

Tube current is held constant while exposure time is divided between the energies to balance contrast-to-noise.

Iterative Reconstruction Alongside

ASiR models noise statistically during image formation to support lower tube current, subject to the licence on this unit.

Licences Documented Before Order

GSI and ASiR were licensed separately, and their status on this scanner is provided by the seller at quotation.

64-Slice Single-Source Dual-Energy CT Scanner

A gantry, patient table and operator console covering routine and spectral computed tomography.

Year of Manufacture: 2010

Bearing on software release, licensed applications, tube generation and support arrangements.

Gemstone Spectral Imaging

Dual-energy acquisition through fast kV switching within a single gantry rotation, supplied as a licensed option.

Switching: 80 and 140 kV Under 0.5 ms

The interval between alternating high and low energy views.

Projection-Based Material Decomposition

Decomposition performed on the measured projection data before reconstruction.

Material Decomposition Field of View: 50 cm

The full scan field available for material separation.

Monochromatic Image Synthesis

Images produced at selectable energies across the spectral range.

Material Density Basis Pairs

Water and iodine, water and calcium and comparable pairs according to the applications licensed.

Effective Atomic Number Mapping

Supporting tissue characterisation from the decomposed data.

Virtual Non-Contrast Imaging

An unenhanced dataset derived from a contrast-enhanced acquisition.

Iodine Quantification

Measurement of contrast enhancement from the iodine basis image.

Metal Artefact Reduction

Reduction of artefact around implants, supported by higher monochromatic energies and dedicated processing.

Gemstone Detector

A cerium-activated garnet composite scintillator with a fast response for spectral separation.

Fast-Sampling Data Acquisition

Sampling rate matched to the switching interval through the acquisition chain.

Constant Tube Current With Divided Exposure Time

Exposure time apportioned between the two energies to balance contrast-to-noise.

Adaptive Statistical Iterative Reconstruction

Statistical noise modelling during image formation, available where licensed.

Rotation Times

Confirmed at quotation, as spectral and conventional protocols use different rotation speeds.

Volume Helical Shuttle

Extended coverage for dynamic studies, available where licensed on this unit.

X-Ray Tube and Generator

Tube type, heat storage capacity and generator output confirmed at quotation.

Tube Condition and Usage

Accumulated scan seconds and slice count provided by the seller at quotation.

DICOM Connectivity

Archive and networking, with the configuration confirmed at quotation.

CE Marking and Declaration of Conformity

Issued by the manufacturer and requested from the seller at quotation.

Decontamination Certificate and Warranty Terms

Provided by the seller at quotation, in line with normal practice for used imaging equipment.

Site Survey and Installation

Room dimensions and access, floor loading, power supply, cooling and radiation shielding assessed before installation, which Medigear.uk can arrange.

This GE Discovery CT750 HD was built in 2010, and the case for it is that a CT number alone can be ambiguous. Attenuation at a single energy can be produced by different materials at different concentrations, and separating them requires measuring the same voxel at two energies. Gemstone Spectral Imaging does that from one source, switching the tube between 80 and 140 kV at intervals under half a millisecond within a single rotation, so high and low energy views interleave and register to one another temporally, decomposition is performed on the projection data before reconstruction, and material separation extends across the full 50 cm field. The Gemstone cerium-activated garnet detector and fast-sampling acquisition are what make that switching rate resolvable. From it follow monochromatic images at selectable energies, material density basis pairs, effective atomic number maps, iodine quantification, virtual non-contrast imaging and reduced artefact around metal, with ASiR available alongside for lower-current acquisition. Beneath the spectral capability sits a 64-slice scanner for routine work. Diagnostic interpretation remains with the reporting radiologist. The GSI and ASiR licences, software release, tube type and condition are provided by the seller at quotation. Medigear.uk lists the scanner for UK business buyers and can arrange a site survey, delivery, installation, staff familiarisation, service cover and the supply of spares and consumables. Enquire for a written quotation.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

It is a 64-slice single-source CT scanner with dual-energy capability through fast kV switching, covering routine computed tomography alongside spectral studies according to the licences supplied. This scanner was built in 2010.

Dual-energy acquisition in which the tube switches between 80 and 140 kV at intervals under half a millisecond within a single rotation, interleaving high and low energy views.

Because the two energy measurements register to each other temporally when acquired almost simultaneously, which is what allows decomposition to be performed on the projection data before reconstruction.

The full 50 cm scan field of view.

Monochromatic images at selectable energies, material density images in basis pairs such as water and iodine, and effective atomic number maps.

Tissue characterisation, quantification of iodinated contrast, virtual non-contrast imaging and reduction of artefact around metal.

A cerium-activated garnet composite scintillator with a fast response, paired with fast-sampling data acquisition, which is what allows consecutive views at different energies to be separated.

Tube current stays constant across both, with exposure time divided between them to balance the contrast-to-noise ratio.

It was licensed separately, so its presence on this unit is set out by the seller at quotation.

Yes. Beneath the spectral capability it is a 64-slice scanner covering a routine list.

Tube type, heat storage capacity, accumulated scan seconds and slice count, which bear on remaining working life and on sustained spectral acquisition.