Nuclear and Radiological Engineering An Image-Based Canine Phantom for Pre- Clinical Evaluations of Osteosarcoma Molecular Radiotherapy WE Bolch, Laura Padilla, Choonsik Lee Nuclear & Radiological Engineering College of Engineering Rowan Milner Small Animal Clinical Sciences College of Veterinary Sciences Amir Shahlaee Department of Pediatrics College of Medicine Computational Medical Physics Workshop II – ANS Working Group October 3, 2007
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Nuclear and Radiological Engineering
An Image-Based Canine Phantom for Pre-Clinical Evaluations of Osteosarcoma
Molecular Radiotherapy
WE Bolch, Laura Padilla, Choonsik LeeNuclear & Radiological Engineering
College of Engineering
Rowan MilnerSmall Animal Clinical SciencesCollege of Veterinary Sciences
Amir ShahlaeeDepartment of Pediatrics
College of Medicine
Computational Medical Physics Workshop II – ANS Working GroupOctober 3, 2007
Nuclear and Radiological Engineering
Pediatric Bone Cancers• Osteosarcoma
Malignant tumor of the connective tissues (sarcoma) of bone (osteo)Cells involved: mesenchymal stem cells of bone marrowSites involved: metaphyseal portions of the long bone (growth plates)Approximately 400 cases per year / children < 20 years (63% survival)
• Ewing’s sarcomaAlso called primitive neuroectodermal tumours (PNET)Cell involved: Neuroectoderm – embryonic tissues than develop to brain, spinal cord, and nervous tissues of the peripheral NSSites involved: evenly between extremities and the axial skeletonApproximately 200 cases per year for children < 20 years
• ChondosarcomaMalignant tumor derived from the cartilage cells of bone
Nuclear and Radiological Engineering
Pediatric Bone Cancers
Nuclear and Radiological Engineering
Pediatric Bone Cancers
Nuclear and Radiological Engineering
Pediatric Bone Cancers
Nuclear and Radiological Engineering
Pediatric Bone Cancers
Nuclear and Radiological Engineering
Treatment Options• Surgery (including amputation)
• Chemotherapy
• External beam radiotherapy (> 70 Gy)
• Molecular radiotherapySm-153 EDTMPCovalent bond with SmInterfers with osteoclastsIncorporates within hydroxyapatite crystals
POHOH
OCH2
N
CH2
PO
OHOH
CH2 CH2 POH
OCH2
N
CH2 PO
OHOH
OH
EDTMP
Nuclear and Radiological Engineering
Preclinical Studies of Radiopharmaceuticals
• Murine model – micePositives: available, short lifespan, genome well establishedNegatives: skeletal system very small relative to human dimensions
• Primate model – baboonsPositives: extremely close to skeletal structure of humansNegatives: limited availability and very expensive
• Canine model – dogsPositives: large population available (4 million cancers / year)Postives: canine genome recently establishedPostives: many histological and biochemical similarities in diseaseNegatives: not many – lack of a dosimetry phantom!
Nuclear and Radiological Engineering
AACR 2006Comparative gene expression analysis of canine and
human osteosarcoma Paoloni et al. NIH
• “Tumors from both species were co-mingled within a single osteosarcoma cluster.”
• “This data provides strong genomic evidence of the similarity and relevance of canine osteosarcoma as model for the human disease.”
Nuclear and Radiological Engineering
Equation-Based Computational PhantomsOak Ridge National Laboratory (ORNL) Series
Nuclear and Radiological Engineering
Voxel-Based Computational PhantomsUniversity of Florida (UF) Series
Nuclear and Radiological Engineering
Voxel-Based Computational PhantomsUniversity of Florida (UF) Series
Nuclear and Radiological Engineering
Hybrid PhantomsAnatomic Realism (Voxel) with Scalability (Stylized)
UF hybrid female (left) and male (right) newborns
Nuclear and Radiological Engineering
Procedure for hybrid phantoms
Segmentation Polygonization
NURBS modeling Voxelization
Segment CT slices using 3D-DOCTOR, 3D segmenting and rendering software
Convert segmented model into polygon mesh using built-in function of 3D-DOCTOR
Make NURBS model from
polygon mesh model using
Rhinoceros, 3D NURBS modeling
software, andmatch to ICRP89 reference organ
mass
Convert NURBS model into voxel model using Voxelizer, in-house MATLAB code
Nuclear and Radiological Engineering
Creation of the NURBS Lung Model
Nuclear and Radiological Engineering
Creation of the NURBS GI Tract Model
Nuclear and Radiological Engineering
Creation of the NURBS Rib Cage Model
Nuclear and Radiological Engineering
Adjustment of Urinary Bladder Model
Nuclear and Radiological Engineering
Final NURBS Hybrid Canine
Phantom
Nuclear and Radiological Engineering
Organ System Density Organ Volume Organ Mass Organ System Density Organ Volume Organ Mass(g / cm 3 ) (cm 3 ) (g) (g / cm 3 ) (cm 3 ) (g)