By Vvon Engineering Team | Published
Compare NU4 PET IQ, MicroPET PSF and MicroCT test objects for research scanners. Prepare a quotation brief around field of view, measurement purpose, accessories and documentation.
A research team buying a small-field-of-view PET or PET/CT system needs a QA specification that matches that system and its planned measurements. A general request for a PET phantom can return offers for different geometries and test purposes. Start the purchase with the measurement question, then select the phantom and accessories that support it.
Vvon's catalogue includes Leeds Test Objects' NU4 PET IQ, MicroPET PSF and MicroCT set. They address different parts of preclinical imaging assessment. This guide is for equipment procurement and programme planning; it does not provide radionuclide preparation, acquisition or clinical instructions. For a hospital imaging department, see the separate nuclear medicine QA phantom guide.
State whether the purchase supports initial acceptance, a repeatable reference measurement, comparison of reconstruction methods or investigation of a specific change. Identify the scanner model, software version and the protocol or standard edition your team intends to use. Those details allow a supplier to explain why a particular configuration is relevant instead of treating similarly named phantoms as interchangeable.
| Question in the research programme | Catalogue item to assess | Quotation clarification |
|---|---|---|
| Small-field PET image quality and correction behaviour | NU4 PET IQ | Match the specified protocol, dimensions and required accessories. |
| PET point-spread-function measurements in tissue-equivalent surroundings | MicroPET PSF | Confirm material set, capillary fit and positioning arrangement. |
| Image quality of the microCT subsystem | MicroCT set | Identify which test objects and supporting measurement equipment are required. |
Leeds describes NU4 PET IQ for small-field PET image-quality, attenuation-correction and scatter-correction testing, citing NEMA NU4-2008. Its 33.5 mm cylinder incorporates five fillable rods from 1 to 5 mm, two 8 mm cylinders and a uniform section. Match that documented geometry to your intended method.
The cited standard designation is a manufacturer statement about this object. Purchasing it does not by itself establish that a scanner has completed every performance test in a standard. Ask the research physicist to list the measurements it will support, the analysis needed and any other test objects or instruments required. Request the current specification and instructions with the NU4 PET IQ quotation.
Leeds' MicroPET PSF uses paired cylinders in six tissue-equivalent materials representing lung, adipose, water and bone. Each pair includes a solid cylinder and one with a central 0.75 mm hole intended for a radionuclide-filled capillary. The documented material and source-holder arrangement distinguishes it from an image-quality phantom containing several fillable structures.
In the MicroPET PSF enquiry, identify the measurement and the positioning constraints inside your scanner. Ask the manufacturer to confirm the compatible capillary dimensions, supplied components and replacement items. Have the responsible team approve the source and handling arrangement. Do not assume the quoted phantom includes radionuclides, a positioning fixture or analysis software.
A PET-focused order can leave the CT assessment undefined. Leeds' MicroCT set includes objects for bone density, low contrast, reconstruction artefacts, uniformity and noise, point spread function and CT dose index. The manufacturer lists 32 mm as the standard diameter and other diameters by request. Confirm the offered dimensions instead of assuming a custom configuration is included.
The MicroCT set listing is a starting point for a CT-specific brief. Ask which objects, holders, software and measuring instruments the proposed protocol needs. The presence of a dose-index phantom in a set does not establish that the quotation includes the detector and reader needed for the intended measurement.
Agree the records before accepting the equipment: phantom identity and configuration, scanner and software version, approved preparation method, positioning references, acquisition settings and analysis settings. Retain the reference dataset and report where your institution permits. If the research objective changes, identify whether the previous baseline remains suitable instead of comparing two differently defined tests.
These records are purchasing and research-management requirements, not operating directions. The responsible physicist or research lead should choose the protocol, test frequency and evaluation criteria with the scanner and phantom manufacturers. Radioactive material, any associated import or possession requirements, and local radiation protection arrangements must be handled through the institution's authorised procedures.
This approach gives the research team a traceable reason for selecting each item and helps procurement compare offers on the same scope. Review the nuclear medicine QA catalogue alongside the actual test plan; buying every available phantom is not a substitute for defining the programme.
Share your application, equipment requirements and procurement timeline. Our engineers can help clarify the configuration and scope for your enquiry.