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8/1/2013
1
Advanced Imaging for Breast Cancer: Screening, Diagnosis, and Assessing Response to Therapy
Advanced Imaging for Breast Cancer: Screening, Diagnosis, and Assessing Response to Therapy
John M. Boone, Ph.D., FAAPM, FSBI, FACRDepartments of Radiology and Biomedical EngineeringUniversity of California Davis Medical Center
John M. Boone, Ph.D., FAAPM, FSBI, FACRDepartments of Radiology and Biomedical EngineeringUniversity of California Davis Medical Center
Breast CTBreast CT
Disclosures (required by UC Davis):
• Varian Imaging Systems, Consultant• CT Imaging, Consultant
• Stanford Research Institute, Consultant• DxRay, Inc, Consultant
• Cedars Sinai Medical Center, Expert Witness• Alston & Bird LLC, Expert Witness
• Varian Imaging Systems, Research Funding• Hologic Corporation, Research Funding
• Fuji Medical Systems, Research Funding• Stanford Research Institute, Research Funding (R21 subcontract)• Siemens Medical Systems, Research Funding
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CT Dedicated Breast CT
8/1/2013
2
5
20012001
20052005
20042004
Albion 2004Bodega 2007
Doheny 2013Cambria 2012 8
Albion
Cambria
Bodega
Doheny
UC Davis Medical Center
8/1/2013
3
9
Spatial Resolution: Modeled & Measured MTF’s
1 1 2 2 3 3( ) (1 exp( / )) (1 exp( / )) (1 exp( / ))gt f A a t T a t T a t T
Albion & Bodega
Cambria (2 x 2) [388 m pixels]
DohenyCambria (1 x 1) [194 m pixels]
3X Spatial Resolution
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CT
11
296
second volunteer imaged: January 2005 12first breast cancer imaged: January 2005
8/1/2013
4
13
True 3D Display !
14
bCT (no injected contrast)
2008
16
PRE CONTRAST POST CONTRAST
PRE CONTRAST POST CONTRAST
bCT (with contrast)
8/1/2013
5
2010
HUAUC = 0.87
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CT
19
∑(fi × Ii) = dꞌ
dꞌ
# ob
servations lesion present
lesion absentpre‐whitened matched filter
“computer observer”
filter
inserted lesion
breast CT image (actual images are used)
inserted non‐lesion
8/1/2013
6
Breast CT
“mammo”46%
mass lesions only / results do not reflect microcalcifications
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CT Background Noise
Anatomical Noise
low
high
8/1/2013
7
Digital Subtraction Angiography(Temporal Subtraction)
Dual Energy Chest Radiography(Energy Subtraction)
Reduces Anatomical Noise
Reduces Anatomical Noise
MammoMammo TomoTomo Breast CTBreast CT
23 patients were imaged using all 3 modalities
27
10 20 30 40 50 60
10
20
30
40
50
60
radial averaging
linear regression
2D Fourier analysis Sylvia SorkinGreenfield Award 2012
8/1/2013
8
Dense BreastsAdipose Breasts
bCT, Tomo, and Mammo Comparisons
breast CTbreast CT mammographymammographytomosynthesistomosynthesis
N = 23 pts1000 ROIs per
breast CTbreast CT mammomammo
Breast CT images
axial view (~cc)
slice thickness (mm)
~10 mm
Tomo
8/1/2013
9
disk diameter (m
m)
tomographic angle
measured data on the breast CT system
Breast CT Images
Mammo
Tomosynthesis Images
0 mm
55 mm
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CT
8/1/2013
10
Shadi Shakeri, M.D.
Prospective Clinical Trial
105 patients /103 lesions (BIRADS 4 or 5)imaged on VCO mammo / tomo / CE‐bCTall biopsied
2 Radiologists Rated Lesions using a 0 to 10 Conspicuity Score
0 = not seen 10 = excellent
malignant
benign
microcalcifications masses
27
1827
31
one‐way ANOVA with correction for multiple comparisons
total 4558
Embargoed Data until Published(so not in printed notes)
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CT Technology
Preliminary Clinical Assessments
Mathematical Observer Metrics
Lesion Insertion / t3D versus 2D
Anatomical noise / M↔T↔bCT
CE‐bCT versus Mammo and Tomo
Summary
Breast CTBreast CTPatients find bCT more comfortable
Radiation dose is the same as 2V mammography
Early trials and computer sims show better mass lesion detection performance than mammography
Computer simulations show bCT reduces anatomical noise / Mammo or Tomo / reasons understood
CE‐bCT has better sensitivity and specificity than mammo or tomo
Patients find bCT more comfortable
Radiation dose is the same as 2V mammography
Early trials and computer sims show better mass lesion detection performance than mammography
Computer simulations show bCT reduces anatomical noise / Mammo or Tomo / reasons understood
CE‐bCT has better sensitivity and specificity than mammo or tomo
Breast CT (Summary)Breast CT (Summary)