Leeds Test Objects in Bangladesh

Vvon Technologies Limited supplies, installs and services Leeds Test Objects equipment across Bangladesh. 95 products are catalogued across Nuclear Medicine & Imaging.

Categories

• Radiology & Radiotherapy QA Phantoms (85)
• Gamma Cameras & SPECT (5)
• Nuclear Medicine QA Phantoms (4)
• Imaging & QA Software (1)

Products

• Gamma Distortion: A rigid PMMA phantom for quality control of geometric distortion and spatial resolution on gamma cameras. A regular array of small holes is filled with activity so the physicist can check point to point distances against true distances and measure the point spread function across the field of view.
• Gamma Flood: A rigid PMMA fillable flood phantom for quality control of detector homogeneity on gamma cameras, and for generating the uniformity correction maps the camera applies. The filling and venting plugs sit on the flat face rather than the edge, so the phantom is filled lying down and the faces do not bulge.
• Gamma Resolution: A four quadrant lead bar phantom in a rigid PMMA housing, used for routine quality control of gamma camera spatial resolution. Each quadrant carries a different bar width and spacing, and engraved pigment filled centre lines allow the phantom to be positioned the same way every time.
• SPECT IQ: A fillable image quality phantom for acceptance and routine testing of SPECT systems. It allows a medical physicist to measure centre of rotation error, uniformity, spatial resolution, volume sensitivity and lesion detectability from a single set of acquisitions.
• VERTO: A dynamic line phantom for gamma camera quality control that replaces heavy fillable flood phantoms and bar masks. A microprocessor controlled line source sweeps back and forth across the detector, starting, stopping and dwelling to the selected program, chosen on the integrated touchscreen.
• AutoPIA: Automatic Phantom Image Analysis software that recognises and analyses test images of Leeds Test Objects phantoms. It calculates reproducible quality indices, stores the results and plots control charts with baseline and threshold values so quality trends and abnormal conditions are visible.
• MicroPET PSF: A tissue equivalent point spread function phantom for pre-clinical PET systems. It comprises pairs of cylinders in six tissue equivalent materials, one solid and one with a central hole to take a capillary filled with radionuclide.
• NU4 PET IQ: A small field of view PET image quality phantom designed for pre-clinical scanners. It allows testing of image quality, attenuation correction and scatter correction using fillable rods, fillable cylinders and a uniform section, to the NEMA NU4 standard.
• PET CT MRI Cubes: A set of seven clear PMMA cubes each holding a small fillable spherical void, used as point source markers for checking alignment between PET, CT and MR. They can be filled with a radionuclide, CT contrast agent or MR contrast agent and sealed with the nylon screw supplied.
• PET IQ: An anthropomorphic PMMA body phantom for PET and PET/CT image quality testing. Six hollow fillable spheres screw into a plate on one face and can be filled with water for cold lesion imaging or with 18F FDG for hot lesion imaging.
• CT TE: A tissue equivalent CT phantom made up of a water equivalent nested head and body section, each drilled with eight holes for interchangeable tissue equivalent inserts. It is suitable for both kV and MV energies, so it can be used for diagnostic CT and for radiotherapy planning checks.
• CTAEC-25: A CT automatic exposure control phantom built from eleven reconfigurable PMMA ellipses of 25 mm thickness. The stack simulates a changing patient cross section along the scan so the constancy of the AEC can be checked, and each step accepts dosimetry or image quality inserts.
• CTAEC-50: A CT automatic exposure control phantom using six reconfigurable PMMA ellipses of 50 mm thickness. It is used for constancy testing of CT AEC systems where a coarser step size than the CTAEC-25 is sufficient.
• CTIQ: A CT image quality phantom built as a PMMA cylinder with recesses for test inserts, sized to nest inside the TO CTDI body phantom. It covers geometric distortion, CT number, MTF, resolution, slice profile and table movement accuracy in one setup.
• MicroCT set: A set of test objects for assessing image quality on pre-clinical microCT systems. It covers bone density, low contrast, reconstruction artefacts, uniformity and noise, point spread function and dose index in a common cylindrical format.
• Mouse Phantom: A tissue mimicking mouse shaped phantom for demonstrating and assessing image quality on pre-clinical microCT scanners. It contains tissue mimicking skeleton, lung and soft tissue, with a choice of soft tissue CT number.
• Quattro: A programmable three axis respiratory motion phantom for 4DCT and PET quality assurance. It pairs a motion arm with a semi-anthropomorphic tissue equivalent chest phantom, driving vertical surrogate motion, horizontal insert motion and continuous twist of the insert at the same time.
• RT ALIGN: A radiotherapy alignment plate carrying fiducial marks for the common square field sizes and embedded ball bearings at the edges, centre and offset positions. It is used on the EPID surface or on the couch for isocentre alignment, field size checks and EPID scaling.
• RT ALIGN ROTATE: The rotating version of the RT ALIGN plate, which can be indexed through a full turn in fixed increments with or without its rotation jig. It carries the same fiducial marks and embedded ball bearings for isocentre alignment, field size and EPID scaling checks.
• RT CUBE: A cubic isocentre phantom with laser alignment marks, two sets of offset marks and a central high density sphere. It is used to check positioning and repositioning accuracy and the coincidence of kV imaging, MV treatment and positioning system isocentres.
• RT EPID-2: A planar MV imaging quality assurance phantom for electronic portal imaging devices. It is placed directly on the EPID surface and covers the MV imaging tests recommended in AAPM TG-142, including geometric accuracy, resolution, low contrast detectability, uniformity and noise.
• TO CTDI: A CT dose index phantom comprising two PMMA cylinders representing the head and the body. Each cylinder is drilled to accept a pencil ion chamber at the centre and at four peripheral positions, so the user can measure CTDI100, CTDIw, CTDIvol and CTDI free in air.
• TO CTDI plus: A three cylinder CT dose index phantom that adds a paediatric head section to the standard head and body sizes. The cylinders nest inside one another and are drilled for a pencil chamber at the centre and at four peripheral positions.
• MagIQ 142: A compact MRI image quality phantom with a main chamber and four test tubes, giving five separately filled signal compartments. It measures geometric distortion, spatial resolution, contrast resolution, fat suppression, SNR, ghosting, uniformity and slice profile.
• MagIQ and MagIQ Duo: An MRI image quality phantom available with a single chamber (MagIQ) or two identical chambers (MagIQ Duo) that can be filled with different solutions to test high and low field in one object. It covers distortion, resolution, contrast, fat suppression, SNR, ghosting, uniformity and slice profile.
• MAGIQ Breast: A pair of MRI phantoms, one for each breast well, each with two separately filled chambers. They allow quantitative measurement of water signal SNR and of fat fraction using Dixon fat separation, or a T1 to T1 fat sat ratio to assess fat suppression.
• MagIQ Diffusion: An MRI phantom for calibrating contrast values in diffusion weighted imaging and apparent diffusion coefficient protocols. It allows the user to measure seven different values in a single acquisition.
• MagIQ EUROSPIN Set TO1 - TO5: A set of five EUROSPIN pattern MRI phantoms covering the main image quality parameters, supplied with filling solutions and a protective case. TO1 to TO5 address signal to noise, distortion and slice profile, slice position, spatial resolution and MTF, and T1 and T2 precision.
• MagIQ Oncology: An MRI phantom for image quality assessment in cancer diagnosis, treatment planning and therapy, aimed particularly at breast and prostate imaging. A cylindrical phantom nests into a body section and carries detachable sections for T1, T2, DCE and gadolinium doped water.
• MagIQ Sphere: A spherical flood fill MRI phantom sized to fit head coils, with a support that stops it rolling on the couch. The spherical shape allows uniformity and SNR to be tested in several planes without repositioning and is less prone to Gibbs artefact than a cylinder.
• MRI Phantom Filling Solutions: Filling solutions for the MagIQ and MagIQ Duo MRI phantoms, supplied in jerricans. Separate 1.5T and 3.0T formulations are available so the phantom relaxation times suit the field strength being tested.
• T1 T2 EUROSPIN Gels: A set of eighteen gel filled tubes with calibrated T1 and T2 values, sized to drop into the MagIQ EUROSPIN TO5 and into the contrast sections of the MagIQ Solo and MagIQ Duo phantoms. They are used to check relaxation time measurement accuracy.
• 21mm Aluminium Attenuator: A patient equivalent aluminium attenuator plate for image quality checks on general radiography systems, built to the IEC beam quality standards. The integral mounting plate lets it drop straight into common accessory rails without adding material to the beam.
• 25mm Aluminium Attenuator: A patient equivalent aluminium attenuator plate for image quality checks on general radiography systems. A permanently attached thin mounting plate means no extra material sits in the beam when the plate is fitted to the accessory rails.
• CBCT-150: A PMMA cuboid phantom for constancy testing of cone beam CT and 3D fluoroscopy systems to DIN 6868-150. Rows of small air holes of decreasing diameter give a direct measure of spatial resolution, and a tripod allows universal positioning.
• CRDDR Set: A set of test objects for annual and commissioning checks on computed radiography and direct digital radiography systems. It covers erasure cycle efficiency, image retention, sensitivity index consistency, uniformity, scaling errors, artefacts, limiting resolution and threshold contrast detail detectability.
• DR-2: A set of test objects for routine image quality checks on digital radiography systems. It brings together a threshold contrast object, a geometry object, a mesh object and an MTF edge with free software.
• DSA 8/54: A constancy test phantom for digital subtraction angiography systems. A moveable PMMA insert carrying aluminium strips simulates blood vessels and is driven during the exposure by an attached pneumatic hand pump.
• DSF Set: A set of four test objects supplementary to the SFS set, checking the parameters most relevant to digital subtraction fluoroscopy imaging. After mask images are taken, the image content is changed by manipulating the plates.
• Fluoro 4 / Fluoro 4-L: An image quality phantom for digital and conventional fluoroscopy, used at acceptance and then routinely. It carries limiting spatial resolution, low contrast details, a seventeen step copper dynamic range wedge, a kV test area and an unstructured centre marked region.
• FluoroMesh: A routine fluoroscopy resolution phantom scored by counting the number of mesh patterns resolved in the image. Keeping a record of the count over time reveals any trend towards deterioration in imaging performance.
• Fluoroscopy Step Wedge: An eleven step aluminium wedge for use with fluoroscopy systems, used to check contrast and dynamic range response. The first step is taller than the rest, giving a clear reference point in the image.
• Motus Motion Platform: A compact programmable motion arm that introduces controlled motion into quality assurance testing, addressing the limits of static tests on dynamic imaging systems. Leeds Test Objects phantoms clamp to the platform, and tilting the legs adds simultaneous Y axis motion.
• PIX 13: A digital radiography image quality phantom used at acceptance to set a baseline and then routinely to track any drift. It combines limiting spatial resolution, low contrast details, a copper step wedge for dynamic range and radiopaque alignment markers on one plate.
• PMMA/Cu Attenuator: A bonded PMMA and copper attenuator that provides patient equivalent attenuation for use with the PIX 13 and Fluoro-4 image quality phantoms. It is supplied in the square size that matches the phantom being tested, so the whole test object sits behind the same attenuation.
• SFS Set: A set of test objects for annual and commissioning checks on screening fluoroscopy systems. It combines threshold contrast, contrast, greyscale, edge, geometry and mesh test objects with copper filters and a resolution test object.
• SFS-2: An updated screening fluoroscopy test object set for routine image quality checks. It pairs the TO10 and TO12 threshold contrast objects with contrast loss, geometry, mesh and resolution objects so trends in performance can be tracked over time.
• TO 10: A contrast detail test object for fluoroscopic x-ray systems, giving a quick quantitative assessment of image quality. Results are plotted on a threshold detection index curve so performance can be compared over time or between systems.
• TO 12: A contrast detail test object for digital spot imaging systems, giving a quick quantitative assessment of image quality. Results are plotted on a threshold detection index curve so performance can be tracked between test sessions.
• TO 16: A contrast detail test object for computed and digital radiography, giving a quick quantitative assessment of image quality. It offers twelve contrasts per detail size and results plot onto a threshold detection index curve.
• TO 20: A contrast detail test object for digital subtraction fluoroscopy, giving a quick quantitative assessment of image quality. It offers twelve contrasts per detail size and results plot onto a threshold detection index curve.
• TO AEC: A stack of PMMA plates used to check the consistency, repeatability and reproducibility of an x-ray automatic exposure control system. The plates are combined to build up different patient equivalent thicknesses and are supplied in a protective carry bag.
• TO DR: A dynamic range test object for systems that operate by sensing mean signal levels, measuring detail visibility across a wide range of input x-ray intensities. Separate designs cover subtraction and non-subtraction systems.
• TO DSA: A modular phantom set for quality control of digital subtraction angiography image quality. Separate vessel, resolution, bone, slot and step wedge blocks let the user assess dynamic range, iodine contrast resolution, uniformity, linearity and mis-registration artefacts.
• TO MTF: An MTF edge device comprising a tungsten plate mounted on an angulation wheel, so the edge angle can be set repeatably. It is used to measure the modulation transfer function of digital x-ray detectors and is supplied with free analysis software.
• TO XR21: A PMMA phantom that lets the user check interventional fluoroscopy image quality to the NEMA XR21 standard. The plates stack in 25 mm steps up to 300 mm so a range of patient sizes can be simulated in one test session.
• TOR 18FG: A routine fluoroscopy and fluorography test object designed for weekly or monthly use. After a grey scale check the user counts the details detected and the bar patterns resolved, giving a simple repeatable score that reveals any drift in imaging performance.
• TOR ABC: A beam alignment test object for routine weekly or monthly checks on radiography and fluoroscopy systems. It shows whether the light field matches the radiation field, locates the central beam and confirms the central beam angle deviation from perpendicular is within limits.
• TOR CDR: A routine radiography test object for conventional and non-subtractive digital radiography and fluorography. Image quality is scored by counting the details detected and the bar patterns resolved after an initial grey scale check, so trends in performance show up quickly.
• VISIRAY Rulers: Radiopaque and phosphorescent rulers used to check the congruence between the light field, the radiation field and the x-ray image field. The phosphor coating lights up under x-rays and shows no significant afterglow, so a darkened room and a camera are needed.
• Coarto Force Gauge: A digital force gauge that measures the breast compression force applied by a mammography system. It has a dynamic display and a peak hold display, so the maximum force reached during a compression cycle can be read afterwards, and it is supplied with a compressible rubber block.
• CoreView: A kit of test objects for ongoing image quality checks on dedicated core biopsy imaging systems, sized to fit the COREVISION system. It covers threshold contrast, spatial resolution, geometric distortion, uniformity and AEC.
• DMAM2: A full digital mammography phantom set built to the fourth edition European guidelines. It combines a threshold contrast detail plate, filaments, a graded set of PMMA plates, mesh and grid targets, a steel straight edge, a resolution pattern and the filters needed for homogeneity and ghosting tests.
• DMAM2 Gold: The gold contrast detail plate from the DMAM2 set, available on its own for routine threshold contrast scoring on digital mammography systems. It carries 78 details in six sizes across a wide contrast range.
• PIXMAM: A digital mammography image quality phantom made from a stack of finely toleranced PMMA plates, one of which carries an encapsulated aluminium foil. It is used for AEC checks, detector homogeneity, signal to noise ratio and contrast to noise ratio.
• PIXMAM 3D: A routine image quality phantom for digital breast tomosynthesis. It adds a plate holding twenty five embedded spheres for the Z resolution test to the standard PIXMAM stack, so geometric distortion and image resolution can also be checked.
• Tissue Equivalent Materials: A range of tissue equivalent materials supplied in many sizes and shapes, including moulded or machined cavities to house dosimeters. The materials are suitable for both kV and MV energies, so they can be used for diagnostic and radiotherapy dosimetry work.
• TOMO IQ: A complete phantom set for testing tomosynthesis mammography systems, designed to the EUREF breast tomosynthesis protocol. It combines the graded PMMA stack and Z resolution plate with a TORMAM phantom, NPS aluminium filter, MTF steel edge and x-ray rulers.
• TOR MAM: A mammography test object that gives a more natural looking image than a purely geometric phantom, supplementary to TOR MAS or TOR MAX. One half carries filaments, micro-particles and low contrast details, the other simulates breast tissue with micro-calcifications.
• TOR MAS: A routine mammography test object supplied with a 7 cm attenuator stack. It covers sensitometry, resolution limit, low and high contrast detail detectability and simulated micro-calcifications, so a simple score can be recorded at each test session.
• TOR MAX: A routine mammography test object supplied with a 7 cm attenuator stack, offering two resolution limit patterns rather than one. It covers sensitometry, low and high contrast detail detectability and simulated micro-calcifications.
• CBCT-161: A PMMA cylinder phantom for constancy testing of dental cone beam CT systems to DIN 6868-161. It carries soft tissue equivalent, bone equivalent and air sections, and the CBCT-161-A accessory extends it to acceptance testing.
• CBCT-161-Mini: A smaller version of the CBCT-161 phantom for constancy testing of small field of view dental cone beam CT systems, designed in accordance with DIN 6868-161. It comes with a tripod and levelling platform for repeatable positioning.
• DENTEST: A routine dental radiography test object designed for quick monthly checks of imaging performance. Image quality is scored by counting the resolvable steps, contrast details and resolution meshes after an initial uniformity check.
• SedentexCT DI: A dose index phantom for dental cone beam CT, built from a stack of PMMA plates forming a cylinder that represents the adult head. It accommodates several detector types so the department can use the dosimetry equipment it already owns.
• SedentexCT IQ: A dental cone beam CT image quality phantom comprising a PMMA cylinder with recesses for test inserts. The body provides uniform PMMA for noise and an air hole array for geometric distortion, while the inserts add spatial resolution, contrast and density measurements.
• SedentexCTIQ Paediatric: An accessory to the SedentexCT IQ phantom that lets the standard test inserts be placed in a body sized for paediatric cone beam CT imaging. Image quality is then assessed at a phantom size that represents a child rather than an adult head. It complies with the Chinese YYT 0795-2022 standard.
• TO PAN: A dental phantom that quantifies the complex focal trough of a panoramic x-ray unit, allowing a full assessment of the parameters that affect image quality. It works with both film and digital systems and comes with a tripod for universal positioning.
• TO UniDENT: An intra-oral radiographic test object based on a step wedge whose steps are individually calculated to simulate the extremes of the intra-oral imaging task. That makes it more sensitive than a conventional step wedge and gives a clinically relevant indication of the whole imaging chain.
• TOR DEN digital: A dental phantom for checking image quality on digital intra-oral, panoramic and cephalometric x-ray systems. Tests are run at acceptance to set a baseline and then routinely to track any deterioration in the imaging chain.
• TOR DEN plus: A dental phantom for modern high resolution digital intra-oral x-ray systems, covering a higher line pair range than the standard TOR DEN. Tests are run at acceptance to set a baseline and then routinely. It is supplied in a tough case with a bespoke foam insert.
• SONIQ ONE: A tissue mimicking phantom for ultrasound image quality control, carrying grey scale targets, lateral and longitudinal resolution groups and fine pin targets at several depths. It is compact enough to carry between rooms for routine testing.
• SonIQ Uniformity: A uniform ultrasound phantom used to test linear, curvilinear and intra-cavity probes for common defects such as damaged transducer elements or cables. Such defects show up as non-uniformities in the image of a uniform phantom.
• Filters: Added filtration plates for x-ray quality assurance work, supplied in a range of materials, thicknesses and dimensions. Copper, aluminium and lead are available, and the department specifies the size it needs.
• Protective Cases: The protective cases with foam inserts in which Leeds Test Objects test objects are supplied, available to order separately. They are useful as replacements or where a phantom needs to be transported between sites.
• Resolution Test Patterns: A range of x-ray line pair resolution test patterns used to measure limiting spatial resolution and, with a focal spot jig, focal spot size. Leeds Test Objects publishes a user manual covering the pattern types.
• Slit Camera: A slit camera comprising a high density metal filter into which a fine slit has been machined, used for focal spot measurement. The slit width is made to suit the application and the slit length is fixed.
• Star Patterns: X-ray star test patterns used with a focal spot jig to measure the effective focal spot size of an x-ray tube. The blur of the star spokes in the magnified image gives the focal spot dimension. They form part of the Leeds Test Objects range of x-ray test patterns.
• TO FSJ General: A focal spot jig for general radiography x-ray systems, used with an appropriate test pattern to measure the focal spot size. It includes a quick central alignment check and is supplied in a protective carry case.
• TO H2O: A fillable PMMA water phantom with separate plugs for filling and emptying, available in four depths on a common 300 by 300 mm footprint. It gives a water equivalent attenuator for dose and image quality tests where a defined patient thickness is required.
• TO HVL: A filter stand used with aluminium filters and a multimeter to measure the half value layer of an x-ray system. The height adjusts across four settings to suit different modalities and there is a detector recess in the base.
• TO HVL Filters: Aluminium filter sets used with the TO HVL filter stand to measure the half value layer of an x-ray system. Three sets are offered for general radiography, standard mammography and high purity mammography work.
• Vertical Bucky Jig (HANGER): A hanger type vertical bucky jig that holds the TOR ABC beam alignment phantom against an upright bucky, so the alignment check can be made on a vertical stand as well as on the table. It can be bought with the TOR ABC or on its own.
• Vertical Bucky Jig (SUCTION): A suction type vertical bucky jig that holds the TOR ABC beam alignment phantom against an upright bucky, so the alignment check can be made on a vertical stand as well as on the table. It can be bought with the TOR ABC or on its own.
• X-ray Rulers: Radiopaque x-ray rulers used to check radiation field size and image geometry on imaging systems. They are laid across the detector so the field edges can be read off directly in the image, and they are available in various sizes and colours up to two metres in length.