Disclosures CORONARY CALCIUM SCORING REVISITED. Learning Objectives. Scoring Methods. Consultant for M2S, Inc. Coronary Calcium Scoring: Software
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1 CORONARY CALCIUM SCORING REVISITED Disclosures Consultant for M2S, Inc. Julianna M. Czum, MD Director, Division of Cardiothoracic Imaging Department of Radiology Dartmouth Hitchcock Medical Center Assistant Professor of Radiology and Medicine, Section of Cardiology Geisel School of Medicine at Dartmouth Learning Objectives Scoring Methods 1. To describe methods of coronary calcium quantification with CT 2. To discuss the clinical significance of the presence and severity of coronary calcium on CT 1. Agatston score 2. Volume score 3. Mass 4. Coverage score 5. Ordinal score 6. Visual score Coronary Calcium Scoring: Software 130 HU Voxel CT attenuation threshold > 130 HU: CT pixel appears bright white Anatomy independent: Software does not identify coronary arteries Etiology independent: White represents potential calcium DDx includes metal and image noise Coronary Calcium Scoring: Software 130 HU AND 3 contiguous voxels 1.0 mm 3 : approximate volume Software only semi automated Software identifies all pixels that meet threshold criteria Manually select only those pixels that are coronary arterial 1
2 Agatston score Agatston score 3 voxels / 1.0 mm 3 / 130 HU Weighting factor based on peak CT density of calcific plaque Attenuation Weighting factor HU HU HU HU 4 3 voxels / 1.0 mm 3 / 130 HU Agatston score = Σ (area weighting factor) Volume score Volume score = Σ (area increment) No weighting factor Calibration using a standardized phantom Lack of reference data for large populations Mass Mass = Σ (volume calibration factor µ) Calibration factor: from a standardized phantom µ = mean CT density Mass = mg of calcium hydroxyapatite Lack of reference data for large populations Example of Coronary Calcium Software: Agatston Score, Volume Score, and Mass Multiethnic Study of Atherosclerosis (MESA) Spatial distribution of coronary calcium Brown ER, et al. Radiology 2008; 247:
3 Coronary Calcium Coverage Score (CCCS) 3 voxels / 1.0 mm 3 / 130 HU CCCS = # 5mm coronary segments +calcium x 100 total # segments CCCS = % segments calcified MESA CCCS Increased mortality rates proportional to number of calcified segments. Higher mortality rates (statistically significant) for left main coronary lesions. Williams M, et al. JACC: Cardiovascular Imaging 2008; 1: Total [Agatston] coronary artery calcium score remains the preferred metric to refine risk prediction in nearly all patients. Bansal S and Blumenthal RS. JACC: Cardiovascular Imaging 2008; 1: Significance of Coronary Artery Calcium (CAC) Framingham and other similar risk stratification schemes deal with 2 unknowns: Likelihood of coronary atherosclerosis Future risk of coronary events Coronary calcium IS NOT a risk factor for atherosclerosis IS atherosclerosis IS a risk factor for future coronary events CAC cannot identify vulnerable plaque CAC may identify the vulnerable patient Significance of CAC Naghavi M, et al. Circulation 2003; 108: Tip of the Iceberg calcified plaque non calcified (fibrotic and lipidrich) plaque Risk Adjusted All Cause Survival Comparison of FRS and CAC scores for Predicting Mortality ,377 asymptomatic individuals Age: 54±9 yrs Follow-up: 5.0 years 249 Deaths Shaw L, et al. Radiology 2003;228: Shaw L, et al. Radiology 2003;228:
4 MESA ANY CORONARY EVENT Interpretation of Agatston scores 10 fold risk for calcium score > Absolute value of score Doubling of calcium score: 15 40% increase of coronary event risk Detrano R, et al. NEJM 2008; 358: MAJOR CORONARY EVENTS 2. Relative score: Percentile based on age and gender percentiles (EBT) 3. Relative score: Percentile based on age, gender, and race/ethnicity (MESA) Total Agatston Calcium Score: Absolute Value Coronary Calcium on CT Score Interpretation 0 No identifiable atherosclerotic plaque 1 10 Minimal atherosclerotic plaque burden Mild atherosclerotic plaque burden Moderate atherosclerotic plaque burden >400 Severe atherosclerotic plaque burden Minimal (CCS=2) Mild (CCS=81) Used in 10 year coronary event risk prediction Moderate (CCS=329) Severe (CCS=2323) Relative Agatston Calcium Score: Age and Gender Percentiles Useful for prevention/risk modification strategies MESA Useful for prevention/ risk modification strategies Hoff JA, et al. Am J Cardiol 2001; 87: McClelland RL, et al. Circulation 2006;113:
5 NIH Framingham based Calculator for Risk of Myocardial Infarction MESA public website nhlbi.org MESA public website Downloadable spreadsheet S1.xls Pletcher MJ, et al. Heart Views 2004;5: Pletcher MJ, et al. Arch Int Med 2004;164: Why revisit coronary calcium? [I]t is imperative for physicians involved in imaging coronary arteries to understand the importance of coronary calcification as a marker of atherosclerosis. Stanford W. RadioGraphics. 1999; 19: Opening Plenary Session RSNA 1998 Ordinal Coronary Calcium Scoring on Low Dose CT for Lung Cancer Screening Predictive of Cardiovascular Death 0 = Absent 1 = Mild: <1/3 length calcified 2 = Moderate: 1/3 2/3 calcified 3 = Severe: >2/3 length calcified For each of 4 vessels: LM, LAD, LCflx, RCA CAC score 4 CAC score <4 Suggested review for this topic: Role of Nonenhanced Multidetector CT Coronary Artery Calcium Testing in Asymptomatic and Symptomatic Individuals Nasir K and Clouse M. Radiology 2012;264: Sum: Shemesh J, et al. Radiology 2010; 257: ELCAP investigators 5
6 Agatston Scoring of Low Dose CT for Lung Cancer Screening Predicts All Cause and Cardiovascular Mortality Fatal events Nonfatal events Visual (non ordinal) Scoring on Low Dose CT for Lung Cancer Screening Visual Scoring on LDCT: Minimal Mild Moderate Extensive Attendings Jacobs PC, et al. AJR 2012; 198: Agatston on ECG CT: >400 Residents NELSON Trial Kim YK, et al. Int J Cardiovasc Imaging 2014; 30suppl2: Visual Scoring of Coronary Calcium in NLST Predicts All Cause & Cardiovascular Mortality Risk Total Visual Score (TVS) Linear extent of calcification: #Image slices with coronary calcium Score range: 0 4 Thickness of calcification: #Images < or 25% vessel diameter calcified Score range: 1 3 TVS = Σ (linear extent x thickness) 1 vessel TVS = vessel TVS = 0 36 Watts JR Jr, et al. Coron Artery Dis 2015; 26: Shemesh J, et al. Radiology 2010; 257: IN THE END: Similar results, but Shemesh method easier. Adding VALUE in Radiology Perhaps we looking for current missed opportunities that can add even more value that radiologists already provide to patients, providers, and society. One opportunity may be in coronary calcium scoring in Low Dose CT for Lung Cancer Screening. How might we use this information? In addition to CVD risk reduction, imaging evidence of coronary atherosclerosis may serve as an aid to smoking cessation efforts and other behavioral changes. Patient motivation: Seeing is believing Effect of patient visualization of CAC on lifestyle behavioral changes Orakzai, Budoff Am J Cardiol 2008: 101: References 1. Nasir K, Clouse M. Role of nonenhanced multidetector CT in the coronary artery calcium testing in symptomatic and asymptomatic individuals. Radiology 2012;264: Kim YK, Sung YM, Cho SH, et al. Reliability analysis of visual ranking of coronary artery calcification on low dose CT of the thorax for lung cancer screening: comparison with ECG gated calcium scoring CT. Int J Cardiovasc Imaging 2014; 30suppl2:
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