A gel tumour phantom for assessment of the accuracy of manual and automatic delineation of gross tumour volume from FDG-PET/CT
| Autor: | Ayca Londalen, Jan F. Evensen, Otto K Glomset, Karsten Eilertsen, Arne Skretting, Trond Velde Bogsrud |
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| Rok vydání: | 2012 |
| Předmět: |
Models
Anatomic Scanner Difference of Gaussians Gross tumour volume Models Biological Multimodal Imaging Imaging phantom Pattern Recognition Automated Imaging Three-Dimensional Fluorodeoxyglucose F18 Neoplasms Image Interpretation Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging medicine.diagnostic_test business.industry Phantoms Imaging Squamous Cell Carcinoma of Head and Neck Radiotherapy Planning Computer-Assisted Hematology General Medicine Thresholding Tumor Burden Oncology Positron emission tomography Head and Neck Neoplasms Positron-Emission Tomography Carcinoma Squamous Cell Tomography business Nuclear medicine Tomography X-Ray Computed Distance transform Gels Algorithms |
| Zdroj: | Acta oncologica (Stockholm, Sweden). 52(3) |
| ISSN: | 1651-226X |
| Popis: | Introduction. Our primary aim was to make a phantom for PET that could mimic a highly irregular tumour and provide true tumour contours. The secondary aim was to use the phantom to assess the accuracy of different methods for delineation of tumour volume from the PET images. Material and methods. An empty mould was produced on the basis of a contrast enhanced computed tomography (CT) study of a patient with a squamous cell carcinoma in the head and neck region. The mould was fi lled with a homogeneous fast-settling gel that contained both 18 F for positron emission tomography (PET) and an iodine contrast agent. This phantom (mould and gel) was scanned on a PET/CT scanner. A series of reference tumour contours were obtained from the CT images in the PET/CT. Tumour delineation based on the PET images was achieved manually, by isoSUV thresholding, and by a recently developed three-dimensional (3D) Difference of Gaussians algorithm (DoG). Average distances between the PET-derived and reference contours were assessed by a 3D distance transform. Results. The manual, thresholding and DoG delineation methods resulted in volumes that were 146%, 86% and 100% of the reference volume, respectively, and average distance deviations from the reference surface were 1.57 mm, 1.48 mm and 1.0, mm, respectively. Discussion . Manual drawing as well as isoSUV determination of tumour contours in geometrically irregular tumours may be unreliable. The DoG method may contribute to more correct delineation of the tumour. Although the present phantom had a homogeneous distribution of activity, it may also provide useful knowledge in the case of inhomogeneous activity distributions. Conclusion . The geometric irregular tumour phantom with its inherent reference contours was an important tool for testing of different delineation methods and for teaching delineation. |
| Databáze: | OpenAIRE |
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