Pocket Phantom Tool in Improving Accuracy of Quantitative PET/CT Imaging of Patients With Solid Tumors

Completed

• Conditions: Adult Solid Neoplasm
• Interventions: Procedure: Computed Tomography; Device: Imaging Phantoms; Procedure: Positron Emission Tomography

• Registration Number: NCT02822365
• Lead Sponsor: University of Washington

Brief Summary

This pilot study tests the pocket phantom tool in improving the accuracy of quantitative positron emission tomography/computed tomography (PET/CT) imaging of patients with solid tumors. The pocket phantom tool may help test the accuracy of the PET/CT scanner and indicate whether adjustments need to be made to get consistent information.

Detailed Description

PRIMARY OBJECTIVES:

I. Optimize the pocket phantom source design and the bias estimation algorithm: determine the tolerances and variations in the source sphere geometry and radioactive filing process; evaluate the need for higher-activity sources in the presence of increased attenuation (i.e. thicker patients); optimize CT contrast levels for source boundary detection and localization from CT images; evaluate the robustness for use with different scanner parameters (e.g. CT slice thicknesses); modify bias estimation algorithm as needed to take into account changes.

II. Develop automated and robust ID pocket phantom processing and web-based software as a service (SAS) analysis tools: automate initial identification of approximate location of the pocket phantom; add automated DICOM analysis for web-based SAS analysis tools for imaging sites.

III. Conduct phantom studies at multiple imaging centers to evaluate the performance with different imaging protocols, scanners, and reconstruction methods. Also test at multiple time points over 6-9 months to assess longitudinal stability.

IV. Conduct a comparative study with patients (at University of Washington \[UW\]) at multiple time points over 6-12 months to evaluate the performance of the pocket phantom in oncology patient imaging compared with current clinical practice.

OUTLINE:

Patients undergo a PET/CT scan as part of their standard clinical care. While still positioned for the clinical scan, patients undergo additional research PET/CT scans in a smaller region over 10 minutes with the pocket phantom placed nearby and a low-dose single bed position CT scan for attenuation correction (CTAC).

Study Timeline

• Study First Submitted: 2016-06-22
• Study First Submitted QC: 2016-06-29
• Study First Posted: 2016-07-04
• Study Start: 2016-08-24
• Primary Completion: 2019-08-31
• Study Completion: 2019-08-31
• Status Verified: 2019-09
• Last Update Submitted: 2019-09-23
• Last Update Posted: 2019-09-25

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 2

Inclusion Criteria

• Patient receiving clinically indicated PET/CT scan
• Patient has a known solid tumor
• Patient provides consent
• Patient can tolerate additional time in scanner (i.e. not claustrophobic)

Exclusion Criteria

• Patient is pregnant
• Patient cannot or does not provide consent

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Diagnostic (PET/CT)	Imaging Phantoms	Patients undergo a PET/CT scan as part of their standard clinical care. While still positioned for the clinical scan, patients undergo additional research PET/CT scans in a smaller region over 10 minutes with the pocket phantom placed nearby and a low-dose single bed position CTAC.
Diagnostic (PET/CT)	Computed Tomography	Patients undergo a PET/CT scan as part of their standard clinical care. While still positioned for the clinical scan, patients undergo additional research PET/CT scans in a smaller region over 10 minutes with the pocket phantom placed nearby and a low-dose single bed position CTAC.
Diagnostic (PET/CT)	Positron Emission Tomography	Patients undergo a PET/CT scan as part of their standard clinical care. While still positioned for the clinical scan, patients undergo additional research PET/CT scans in a smaller region over 10 minutes with the pocket phantom placed nearby and a low-dose single bed position CTAC.

Primary Outcome Measures

Name	Time	Method
Difference in measured versus known quantitative values of the pocket phantom	At day 1 (All data will be collected during the clinically scheduled appointment. Analysis will follow typical image reconstruction times.)	Compare measured activity of the pocket phantom (as measured by a PET/CT scanner) to the known values of the pocket phantom (as calculated based on half-life activity of known source) to determine accuracy and precision of scanner calibration. This will be used to validate quantitative clinical measurements, like SUV (standardized uptake values), of known solid tumors.

Trial Locations

Locations (1)

Fred Hutch/University of Washington Cancer Consortium; 🇺🇸 Seattle, Washington, United States