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Mochizuki J, Nakaura T, Yoshida N, Nagayama Y, Kidoh M, Uetani H, Funama Y, Hata Y, Azuma M, Hirai T. Spectral imaging with dual-layer spectral detector computed tomography for the detection of perfusion defects in acute coronary syndrome. Heart Vessels 2022; 37:1115-1124. [PMID: 35006370 DOI: 10.1007/s00380-021-02019-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/24/2021] [Indexed: 11/04/2022]
Abstract
To evaluate the feasibility of spectral imaging with dual-layer spectral detector computed tomography (CT) for the diagnosis of acute coronary syndrome. We identified 30 consecutive patients who underwent cardiac CT using dual-layer spectral detector CT and were diagnosed with acute ischemic syndrome by an invasive coronary angiography. We reconstructed 120 kVp images and generated virtual monochromatic images (VMIs; 40-200 keV in 10 keV increments), iodine concentration maps, and effective atomic number (Z) maps. We calculated the contrast and contrast-to-noise ratio (CNR) between myocardial normal and hypo-perfusion and chose the VMIs with the best CNR for quantitative analysis. We compared the image noise, contrast, and CNR of 120 kVp images and the best VMIs, CT value, iodine concentration, and effective Z between myocardial normal and hypo-perfusion with the paired t test. As the X-ray energy decreased, venous attenuation, contrast, and CNR gradually increased. The 40 keV image yielded the best CNR. The contrast and CNR between myocardial normal and hypo-perfusion were significantly higher in 40 keV images than those in 120 kVp images. The iodine concentration and the effective Z were significantly higher in normal myocardium than those in hypo-perfused myocardium. Spectral imaging with dual-layer spectral detector CT is a feasible technique to detect the hypo-perfused area of acute ischemic syndrome.
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Affiliation(s)
- Junji Mochizuki
- Minamino Cardiovascular Hospital, 1-25-1, Hyoue, Hachioji, Tokyo, 192-0918, Japan
| | - Takeshi Nakaura
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan.
| | - Naofumi Yoshida
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan
| | - Yasunori Nagayama
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan
| | - Masafumi Kidoh
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan
| | - Hiroyuki Uetani
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan
| | - Yoshinori Funama
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Yoshiki Hata
- Minamino Cardiovascular Hospital, 1-25-1, Hyoue, Hachioji, Tokyo, 192-0918, Japan
| | - Minako Azuma
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan
| | - Toshinori Hirai
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto-shi, Kumamoto, 860-8556, Japan
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Levi J, Wu H, Eck BL, Fahmi R, Vembar M, Dhanantwar A, Fares A, Bezerra HG, Wilson DL. Comparison of automated beam hardening correction (ABHC) algorithms for myocardial perfusion imaging using computed tomography. Med Phys 2021; 48:287-299. [PMID: 33206403 PMCID: PMC8022227 DOI: 10.1002/mp.14599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/23/2020] [Accepted: 11/05/2020] [Indexed: 02/03/2023] Open
Abstract
PURPOSE Myocardial perfusion imaging using computed tomography (MPI-CT) and coronary CT angiography (CTA) have the potential to make CT an ideal noninvasive imaging gatekeeper exam for invasive coronary angiography. However, beam hardening can prevent accurate blood flow estimation in dynamic MPI-CT and can create artifacts that resemble flow deficits in single-shot MPI-CT. In this work, we compare four automatic beam hardening correction algorithms (ABHCs) applied to CT images, for their ability to produce accurate single images of contrast and accurate MPI flow maps using images from conventional CT systems, without energy sensitivity. METHODS Previously, we reported a method, herein called ABHC-1, where we iteratively optimized a cost function sensitive to beam hardening artifacts in MPI-CT images and used a low order polynomial correction on projections of segmentation-processed CT images. Here, we report results from two new algorithms with higher order polynomial corrections, ABHC-2 and ABHC-3 (with three and seven free parameters, respectively), having potentially better correction but likely reduced estimability. Additionally, we compared results to an algorithm reported by others in the literature (ABHC-NH). Comparisons were made on a digital static phantom with simulated water, bone, and iodine regions; on a digital dynamic anthropomorphic phantom, with simulated blood flow; and on preclinical porcine experiments. We obtained CT images on a prototype spectral detector CT (Philips Healthcare) scanner that provided both conventional and virtual keV images, allowing us to quantitatively compare corrected CT images to virtual keV images. To test these methods' parameter optimization sensitivity to noise, we evaluated results on images obtained using different mAs. RESULTS In images of the static phantom, ABHC-2 reduced beam hardening artifacts better than our previous ABHC-1 algorithm, giving artifacts smaller than 1.8 HU, even in the presence of high noise which should affect parameter optimization. Taken together, the quality of static phantom results ordered ABHC-2> ABHC-3> ABHC-1>> ABHC-NH. In an anthropomorphic MPI-CT simulator with homogeneous myocardial blood flow of 100 ml⋅min-1 ⋅100 g-1 , blood flow estimation results were 122 ± 24 (FBP), 135 ± 24 (ABHC-NH), 104 ± 14 (ABHC-1), 100 ± 12 (ABHC-2), and 108 ± 18 (ABHC-3) ml⋅min-1 ⋅100 g-1 , showing ABHC-2 as a clear winner. Visual and quantitative evaluations showed much improved homogeneity of myocardial flow with ABHC-2, nearly eliminating substantial artifacts in uncorrected flow maps which could be misconstrued as flow deficits. ABHC-2 performed universally better than ABHC-1, ABHC-3, and ABHC-NH in simulations with different acquisitions (varying noise and kVp values). In the presence of a simulated flow deficit, all ABHC methods retained the flow deficit, and ABHC-2 gave the most accurate flow ratio and homogeneity. ABHC-3 corrected phantom flow values were slightly better than ABHC-2, in noiseless images, suggesting that reduced quality in noisy images was due to reduced estimability. In an experiment with a pig expected to have uniform flow, ABHC-2 applied to conventional images improved flow maps to compare favorably to those from 70keV images. CONCLUSION The automated algorithm can be used with different parametric BH correction models. ABHC-2 improved MPI-CT blood flow estimation as compared to other approaches and was robust to noisy images. In simulation and preclinical experiments, ABHC-2 gave results approaching gold standard 70 keV measurements.
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Affiliation(s)
- Jacob Levi
- Department of Physics, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Hao Wu
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Brendan L Eck
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Rachid Fahmi
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Mani Vembar
- Philips Healthcare, Cleveland, OH, 44143, USA
| | | | - Anas Fares
- Cardiovascular Imaging Core Laboratory, Harrington Heart & Vascular Institute, University Hospitals Case Medical Center, Cleveland, OH, 44106, USA
| | - Hiram G Bezerra
- Cardiovascular Imaging Core Laboratory, Harrington Heart & Vascular Institute, University Hospitals Case Medical Center, Cleveland, OH, 44106, USA
| | - David L Wilson
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
- Department of Radiology, Case Western Reserve University, Cleveland, OH, 44106, USA
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Aoyama R, Murata T, Ishikawa J, Harada K. Case report of non-ST-segment elevation myocardial infarction diagnosed in spectral detector-based computed tomography performed for the diagnosis of acute pulmonary embolism. Eur Heart J Case Rep 2020; 4:1-7. [PMID: 33426452 PMCID: PMC7780472 DOI: 10.1093/ehjcr/ytaa284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 04/15/2020] [Accepted: 07/29/2020] [Indexed: 11/16/2022]
Abstract
Background Contrast-enhanced spectral detector-based computed tomography (SDCT) allows for the comprehensive and retrospective analysis. We report a case of pulmonary thromboembolism (PE) accompanied by non-ST-segment elevation myocardial infarction (NSTEMI) diagnosed by SDCT. Case summary A 72-year-old man with diabetes mellitus, hypertension, and prostate cancer suddenly developed chest and back pain and had difficulty in breathing at rest. Electrocardiography showed a right bundle branch block without significant ST-segment change. The initial serum troponin I level was 0.05 ng/mL, and the d-dimer level was 14.7 μg/mL. Spectral detector-based computed tomography showed bilateral scattered PE. After admission, his chest pain persisted, and the serum troponin I level 3 h after admission was elevated to 0.90 ng/mL. Reconstruction of SDCT images showed a perfusion defect of the posterolateral left ventricle myocardium. A coronary angiogram showed total occlusion of the obtuse marginal branch (OM); percutaneous coronary intervention was performed. Furthermore, we administered him with oral anticoagulants (OACs) for PE. Spectral detector-based computed tomography tests performed 6 months after the treatment was initiated, until when the dual antiplatelet therapy and OAC therapy were continued, showed improvement in perfusion defects of both pulmonary fields and the myocardium. His treatment was deescalated to single antiplatelet therapy and OAC, and the patient has had a good course. Discussion Non-ST-segment elevation myocardial infarction is sometimes difficult to diagnose accurately, especially in the hyper-acute phase or in the OM branch. The reconstruction of spectral images from enhanced SDCT was helpful to diagnose this unique combination of PE and NSTEMI and may be useful for evaluating therapeutic effects in such patients.
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Affiliation(s)
- Rie Aoyama
- Department of Cardiology, Tokyo Metropolitan Geriatric Hospital, 35-2 Sakaechou, Itabashi-ku, Tokyo 173-0015, Japan
| | - Teppei Murata
- Department of Cardiology, Tokyo Metropolitan Geriatric Hospital, 35-2 Sakaechou, Itabashi-ku, Tokyo 173-0015, Japan
| | - Joji Ishikawa
- Department of Cardiology, Tokyo Metropolitan Geriatric Hospital, 35-2 Sakaechou, Itabashi-ku, Tokyo 173-0015, Japan
| | - Kazumasa Harada
- Department of Cardiology, Tokyo Metropolitan Geriatric Hospital, 35-2 Sakaechou, Itabashi-ku, Tokyo 173-0015, Japan
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Clinical utility of early postoperative cardiac multidetector computed tomography after coronary artery bypass grafting. Sci Rep 2020; 10:9186. [PMID: 32514056 PMCID: PMC7280270 DOI: 10.1038/s41598-020-66176-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 05/13/2020] [Indexed: 11/22/2022] Open
Abstract
We evaluated the clinical utility of early postoperative cardiac computed tomography (CT) for evaluating left ventricular (LV) function and predicting prognosis in patients who had undergone coronary artery bypass grafting (CABG). Of the 205 patients who underwent CABG from March 2011 to December 2014, 136 underwent early postoperative cardiac CT (within 30 days after CABG) and were enrolled as the study population. The baseline and postoperative follow-up echocardiographic findings, major adverse cardiac events (MACE), and death were recorded for a follow-up period (mean, 5.9 ± 1.1 years). Functional cardiac CT parameters were compared to echocardiographic measurements. The associations between cardiac CT findings and functional recovery and prognosis were evaluated by logistic regression analyses. The LVEF measured via cardiac CT was significantly higher (56.2 ± 11.5% vs. 61.9 ± 12.9%; p = 0.0002) compared to those via early postoperative echocardiography, but the wall motion score index (WMSI) was not significantly different (1.23 ± 0.33 vs. 1.21 ± 0.28, p = 0.5041) between the two methods. During the follow-up period, 17 patients (12.5%) died and 40 (29.4%) developed MACE. Both the LVEF and WMSI measured with early postoperative echocardiography (p = 0.0202 and odds ratio [OR] = 5.0171, p = 0.0039, respectively), and cardiac CT (OR = 0.9625, p = 0.0091 and OR = 14.3605, p = 0.0001, respectively) predicted MACE OR = 0.9630, but only the WMSI, measured using cardiac CT, predicted all-cause death (OR = 10.6017, p = 0.0035). In CABG patients, LVEF and the WMSI measured with early postoperative cardiac CT were comparable with echocardiography and predicted the development of MACE and all-cause death.
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Non-gated high-pitch computed tomography aortic angiography: Myocardial perfusion defects in patients with suspected aortic dissection. J Cardiovasc Comput Tomogr 2017; 11:208-212. [DOI: 10.1016/j.jcct.2017.04.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 03/20/2017] [Accepted: 04/11/2017] [Indexed: 11/22/2022]
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CT myocardial perfusion imaging: current status and future perspectives. Int J Cardiovasc Imaging 2017; 33:1009-1020. [DOI: 10.1007/s10554-017-1102-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 02/24/2017] [Indexed: 12/24/2022]
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The Potential Role of Combined Highly Sensitive Troponin and Coronary Computed Tomography Angiography in the Evaluation of Patients with Suspected Acute Coronary Syndrome in the Emergency Department. CURRENT CARDIOVASCULAR IMAGING REPORTS 2016. [DOI: 10.1007/s12410-016-9393-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ferencik M, Hoffmann U, Bamberg F, Januzzi JL. Highly sensitive troponin and coronary computed tomography angiography in the evaluation of suspected acute coronary syndrome in the emergency department. Eur Heart J 2016; 37:2397-405. [PMID: 26843275 PMCID: PMC6279199 DOI: 10.1093/eurheartj/ehw005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 12/16/2015] [Accepted: 01/05/2016] [Indexed: 02/02/2023] Open
Abstract
The evaluation of patients presenting to the emergency department with suspected acute coronary syndrome (ACS) remains a clinical challenge. The traditional assessment includes clinical risk assessment based on cardiovascular risk factors with serial electrocardiograms and cardiac troponin measurements, often followed by advanced cardiac testing as inpatient or outpatient (i.e. stress testing, imaging). Despite this costly and lengthy work-up, there is a non-negligible rate of missed ACS with an increased risk of death. There is a clinical need for diagnostic strategies that will lead to rapid and reliable triage of patients with suspected ACS. We provide an overview of the evidence for the role of highly sensitive troponin (hsTn) in the rapid and efficient evaluation of suspected ACS. Results of recent research studies have led to the introduction of hsTn with rapid rule-in and rule-out protocols into the guidelines. Highly sensitive troponin increases the sensitivity for the detection of myocardial infarction and decreases time to diagnosis; however, it may decrease the specificity, especially when used as a dichotomous variable, rather than continuous variable as recommended by guidelines; this may increase clinician uncertainty. We summarize the evidence for the use of coronary computed tomography angiography (CTA) as the rapid diagnostic tool in this population when used with conventional troponin assays. Coronary CTA significantly decreases time to diagnosis and discharge in patients with suspected ACS, while being safe. However, it may lead to increase in invasive procedures and includes radiation exposure. Finally, we outline the opportunities for the combined use of hsTn and coronary CTA that may result in increased efficiency, decreased need for imaging, lower cost, and decreased radiation dose.
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Affiliation(s)
- Maros Ferencik
- Knight Cardiovascular Institute, Oregon Health and Science University, 3180 SW Sam Jackson Park Road, Mail Code UHN62, Portland, OR 97239, USA Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA Cardiac MR PET CT Program, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Udo Hoffmann
- Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA Cardiac MR PET CT Program, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA Cardiology Division, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
| | - Fabian Bamberg
- Department of Radiology, University of Tuebingen, Tuebingen, Germany
| | - James L Januzzi
- Cardiology Division, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Abstract
Noninvasive cardiac imaging has an important role in the assessment of patients with acute-onset chest pain. In patients with suspected acute coronary syndrome (ACS), cardiac imaging offers incremental value over routine clinical assessment, the electrocardiogram, and blood biomarkers of myocardial injury, to confirm or refute the diagnosis of coronary artery disease and to assess future cardiovascular risk. This Review covers the current guidelines and clinical use of the common noninvasive imaging techniques, including echocardiography and stress echocardiography, computed tomography coronary angiography, myocardial perfusion scintigraphy, positron emission tomography, and cardiovascular magnetic resonance imaging, in patients with suspected ACS, and provides an update on the developments in noninvasive imaging techniques in the past 5 years.
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Acute coronary syndrome: evaluation of detection capability using non-electrocardiogram-gated parenchymal phase CT imaging. Jpn J Radiol 2016; 34:331-8. [DOI: 10.1007/s11604-016-0527-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 01/23/2016] [Indexed: 12/20/2022]
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Bamberg F. The Whole Is Greater Than the Sum of its Parts: Combining CT Angiography and Highly Sensitive Troponin in the Diagnostic Work-Up of Patients With Acute Chest Pain. JACC Cardiovasc Imaging 2015; 8:1282-4. [PMID: 26563857 DOI: 10.1016/j.jcmg.2015.08.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 08/04/2015] [Accepted: 08/13/2015] [Indexed: 10/22/2022]
Affiliation(s)
- Fabian Bamberg
- Department of Diagnostic and Interventional Radiology, University of Tübingen, Tübingen, Germany.
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Maroules CD, Cury RC, Ghoshhajra BB, Hoffmann U, Litt HI, Blankstein R, Abbara S. Strategy for Building a Successful Coronary CT Angiography Program in the Emergency Department. CURRENT CARDIOVASCULAR IMAGING REPORTS 2015. [DOI: 10.1007/s12410-015-9337-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schlett CL, Hoffmann U, Geisler T, Nikolaou K, Bamberg F. Cardiac computed tomography for the evaluation of the acute chest pain syndrome: state of the art. Radiol Clin North Am 2015; 53:297-305. [PMID: 25726995 DOI: 10.1016/j.rcl.2014.11.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Coronary computed tomography angiography (CCTA) is recommended for the triage of acute chest pain in patients with a low-to-intermediate likelihood for acute coronary syndrome. Absence of coronary artery disease (CAD) confirmed by CCTA allows rapid emergency department discharge. This article shows that CCTA-based triage is as safe as traditional triage, reduces the hospital length of stay, and may provide cost-effective or even cost-saving care.
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Affiliation(s)
- Christopher L Schlett
- Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Im Neuenheimer Feld 110, Heidelberg 69120, Germany; Cardiac MR PET CT Program, Massachusetts General Hospital, Harvard Medical School, 165 Cambridge St, Suite 400, Boston, MA 02114, USA
| | - Udo Hoffmann
- Cardiac MR PET CT Program, Massachusetts General Hospital, Harvard Medical School, 165 Cambridge St, Suite 400, Boston, MA 02114, USA
| | - Tobias Geisler
- Department of Cardiology and Cardiovascular Medicine University Hospital of Tübingen, Hoppe-Seyler-Straβe 3, Tübingen 72076, Germany
| | - Konstantin Nikolaou
- Department of Diagnostic and Interventional Radiology, University Hospital of Tübingen, Hoppe-Seyler-Straβe 3, Tübingen 72076, Germany
| | - Fabian Bamberg
- Cardiac MR PET CT Program, Massachusetts General Hospital, Harvard Medical School, 165 Cambridge St, Suite 400, Boston, MA 02114, USA; Department of Diagnostic and Interventional Radiology, University Hospital of Tübingen, Hoppe-Seyler-Straβe 3, Tübingen 72076, Germany.
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Pursnani A, Lee AM, Mayrhofer T, Ahmed W, Uthamalingam S, Ferencik M, Puchner SB, Bamberg F, Schlett CL, Udelson J, Hoffmann U, Ghoshhajra BB. Early resting myocardial computed tomography perfusion for the detection of acute coronary syndrome in patients with coronary artery disease. Circ Cardiovasc Imaging 2015; 8:e002404. [PMID: 25752898 PMCID: PMC5996992 DOI: 10.1161/circimaging.114.002404] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 02/03/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND Acute rest single-photon emission computed tomography-myocardial perfusion imaging (SPECT-MPI) has high predictive value for acute coronary syndrome (ACS) in emergency department patients. Prior studies have shown excellent agreement between rest/stress computed tomography perfusion (CTP) and SPECT-MPI, but the value of resting CTP (rCTP) in acute chest pain triage remains unclear. We sought to determine the diagnostic accuracy of early rCTP, incremental value beyond obstructive coronary artery disease (CAD; ≥50% stenosis), and compared early rCTP to late stress SPECT-MPI in patients with CAD presenting with suspicion of ACS to the emergency department. METHODS AND RESULTS In this prespecified subanalysis of 183 patients (58.1±10.2 years; 33% women), we included patients with any CAD by coronary computed tomography angiography (CCTA) from Rule Out Myocardial Infarction Using Computer-Assisted Tomography I. rCTP was assessed semiquantitatively, blinded to CAD interpretation. Overall, 31 had ACS and 48 had abnormal rCTP. Sensitivity and specificity of rCTP for ACS were 48% (95% confidence interval [CI], 30%-67%) and 78% (95% CI, 71%-85%), respectively. rCTP predicted ACS (adjusted odds ratio, 3.40 [95% CI, 1.37-8.42]; P=0.008) independently of obstructive CAD, and sensitivity for ACS increased from 77% (95% CI, 59%-90%) for obstructive CAD to 90% (95% CI, 74%-98%) with addition of rCTP (P=0.05). In a subgroup undergoing late rest/stress SPECT-MPI (n=81), CCTA/rCTP had noninferior discriminatory value to CCTA/SPECT-MPI (area under the curve, 0.88 versus 0.90; P=0.64) using a noninferiority margin of 10%. CONCLUSIONS Early rCTP provides incremental value beyond obstructive CAD to detect ACS. CCTA/rCTP is noninferior to CCTA/SPECT-MPI to discriminate ACS and presents an attractive alternative to triage patients presenting with acute chest pain. CLINICAL TRIAL REGISTRATION URL http://www.clinicaltrials.gov. Unique identifier: NCT00990262.
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Affiliation(s)
- Amit Pursnani
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.).
| | - Ashley M Lee
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Thomas Mayrhofer
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Waleed Ahmed
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Shanmugam Uthamalingam
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Maros Ferencik
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Stefan B Puchner
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Fabian Bamberg
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Christopher L Schlett
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - James Udelson
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Udo Hoffmann
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
| | - Brian B Ghoshhajra
- From the Cardiovascular Division, NorthShore University HealthSystem, Evanston, IL (A.P.); Cardiac MR PET CT Program, Division of Cardiology, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston (A.P., A.M.L., T.M., W.A., S.U., M.F., S.B.P., U.H., B.B.G.); Department of Clinical Radiology, Ludwig-Maximilians University, Klinikum Grosshadern, Munich, Germany (F.B.); Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Heidelberg, Germany (C.L.S.); and Division of Cardiology and Cardiovascular Center, Tufts Medical Center, Boston, MA (J.U.)
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15
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Rizvi A, Deaño RC, Bachman DP, Xiong G, Min JK, Truong QA. Analysis of ventricular function by CT. J Cardiovasc Comput Tomogr 2015; 9:1-12. [PMID: 25576407 PMCID: PMC4329068 DOI: 10.1016/j.jcct.2014.11.007] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 11/14/2014] [Indexed: 11/22/2022]
Abstract
The assessment of ventricular function, cardiac chamber dimensions, and ventricular mass is fundamental for clinical diagnosis, risk assessment, therapeutic decisions, and prognosis in patients with cardiac disease. Although cardiac CT is a noninvasive imaging technique often used for the assessment of coronary artery disease, it can also be used to obtain important data about left and right ventricular function and morphology. In this review, we will discuss the clinical indications for the use of cardiac CT for ventricular analysis, review the evidence on the assessment of ventricular function compared with existing imaging modalities such cardiac magnetic resonance imaging and echocardiography, provide a typical cardiac CT protocol for image acquisition and postprocessing for ventricular analysis, and provide step-by-step instructions to acquire multiplanar cardiac views for ventricular assessment from the standard axial, coronal, and sagittal planes. Furthermore, both qualitative and quantitative assessments of ventricular function as well as sample reporting are detailed.
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Affiliation(s)
- Asim Rizvi
- Department of Radiology, Dalio Institute of Cardiovascular Imaging, New York-Presbyterian Hospital and Weill Cornell Medical College, Suite 108, 413 East 69th Street, New York, NY 10021, USA
| | - Roderick C Deaño
- Division of Cardiovascular Disease, New York-Presbyterian Hospital and Weill Cornell Medical College, New York, NY, USA
| | - Daniel P Bachman
- Department of Radiology, Dalio Institute of Cardiovascular Imaging, New York-Presbyterian Hospital and Weill Cornell Medical College, Suite 108, 413 East 69th Street, New York, NY 10021, USA
| | - Guanglei Xiong
- Department of Radiology, Dalio Institute of Cardiovascular Imaging, New York-Presbyterian Hospital and Weill Cornell Medical College, Suite 108, 413 East 69th Street, New York, NY 10021, USA
| | - James K Min
- Department of Radiology, Dalio Institute of Cardiovascular Imaging, New York-Presbyterian Hospital and Weill Cornell Medical College, Suite 108, 413 East 69th Street, New York, NY 10021, USA; Division of Cardiovascular Disease, New York-Presbyterian Hospital and Weill Cornell Medical College, New York, NY, USA
| | - Quynh A Truong
- Department of Radiology, Dalio Institute of Cardiovascular Imaging, New York-Presbyterian Hospital and Weill Cornell Medical College, Suite 108, 413 East 69th Street, New York, NY 10021, USA; Division of Cardiovascular Disease, New York-Presbyterian Hospital and Weill Cornell Medical College, New York, NY, USA.
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16
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Azarisman SM, Teo KS, Worthley MI, Worthley SG. Role of cardiovascular magnetic resonance in assessment of acute coronary syndrome. World J Cardiol 2014; 6:405-414. [PMID: 24976912 PMCID: PMC4072830 DOI: 10.4330/wjc.v6.i6.405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2013] [Revised: 03/10/2014] [Accepted: 04/19/2014] [Indexed: 02/07/2023] Open
Abstract
Cardiovascular disease (CVD) is the leading cause of death in the western world and is becoming more important in the developing world. Recently, advances in monitoring, revascularisation and pharmacotherapy have resulted in a reduction in mortality. However, although mortality rates have declined, the burden of disease remains large resulting in high direct and indirect healthcare costs related to CVDs. In Australia, acute coronary syndrome (ACS) accounts for more than 300000 years of life lost due to premature death and a total cost exceeding eight billion dollars annually. It is also the main contributor towards the discrepancy in life expectancy between indigenous and non-indigenous Australians. The high prevalence of CVD along with its associated cost urgently requires a reliable but non-invasive and cost-effective imaging modality. The imaging modality of choice should be able to accelerate the diagnosis of ACS, aid in the risk stratification of de novo coronary artery disease and avail incremental information of prognostic value such as viability which cardiovascular magnetic resonance (CMR) allows. Despite its manifold benefits, there are limitations to its wider use in routine clinical assessment and more studies are required into assessing its cost-effectiveness. It is hoped that with greater development in the technology and imaging protocols, CMR could be made less cumbersome, its imaging protocols less lengthy, the technology more inexpensive and easily applied in routine clinical practice.
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17
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Dave DM, Ferencic M, Hoffmann U, Udelson JE. Imaging techniques for the assessment of suspected acute coronary syndromes in the emergency department. Curr Probl Cardiol 2014; 39:191-247. [PMID: 24952880 DOI: 10.1016/j.cpcardiol.2014.05.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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19
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Bindschadler M, Modgil D, Branch KR, La Riviere PJ, Alessio AM. Simulation Evaluation of Quantitative Myocardial Perfusion Assessment from Cardiac CT. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2014; 9033:903303. [PMID: 25395812 PMCID: PMC4225804 DOI: 10.1117/12.2043563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Contrast enhancement on cardiac CT provides valuable information about myocardial perfusion and methods have been proposed to assess perfusion with static and dynamic acquisitions. There is a lack of knowledge and consensus on the appropriate approach to ensure 1) sufficient diagnostic accuracy for clinical decisions and 2) low radiation doses for patient safety. This work developed a thorough dynamic CT simulation and several accepted blood flow estimation techniques to evaluate the performance of perfusion assessment across a range of acquisition and estimation scenarios. Cardiac CT acquisitions were simulated for a range of flow states (Flow = 0.5, 1, 2, 3 ml/g/min, cardiac output = 3,5,8 L/min). CT acquisitions were simulated with a validated CT simulator incorporating polyenergetic data acquisition and realistic x-ray flux levels for dynamic acquisitions with a range of scenarios including 1, 2, 3 sec sampling for 30 sec with 25, 70, 140 mAs. Images were generated using conventional image reconstruction with additional image-based beam hardening correction to account for iodine content. Time attenuation curves were extracted for multiple regions around the myocardium and used to estimate flow. In total, 2,700 independent realizations of dynamic sequences were generated and multiple MBF estimation methods were applied to each of these. Evaluation of quantitative kinetic modeling yielded blood flow estimates with an root mean square error (RMSE) of ∼0.6 ml/g/min averaged across multiple scenarios. Semi-quantitative modeling and qualitative static imaging resulted in significantly more error (RMSE = ∼1.2 and ∼1.2 ml/min/g respectively). For quantitative methods, dose reduction through reduced temporal sampling or reduced tube current had comparable impact on the MBF estimate fidelity. On average, half dose acquisitions increased the RMSE of estimates by only 18% suggesting that substantial dose reductions can be employed in the context of quantitative myocardial blood flow estimation. In conclusion, quantitative model-based dynamic cardiac CT perfusion assessment is capable of accurately estimating MBF across a range of cardiac outputs and tissue perfusion states, outperforms comparable static perfusion estimates, and is relatively robust to noise and temporal subsampling.
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20
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Cheezum MK, Bittencourt MS, Hulten EA, Scirica BM, Villines TC, Blankstein R. Coronary computed tomographic angiography in the emergency room: state of the art. Expert Rev Cardiovasc Ther 2014; 12:241-53. [PMID: 24417341 DOI: 10.1586/14779072.2014.877345] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Chest pain is a common complaint in the emergency department often necessitating testing to exclude underlying obstructive coronary artery disease. While the traditional evaluation of patients with suspected acute coronary syndrome often consists of serial electrocardiograms and cardiac biomarkers, followed by selective use of stress testing for further risk stratification, this approach is costly and inefficient. Recently, coronary computed tomographic angiography (CTA) has offered an alternative approach with a high sensitivity and negative predictive value to exclude obstructive coronary artery disease that can rapidly identify patients with low rates of downstream major adverse cardiac events. In this review, the authors provide an overview of available data on the use of CTA for evaluating acute chest pain, while emphasizing its advantages and disadvantages compared to existing strategies. In addition, we provide a suggested algorithm to identify how CTA can be incorporated into the evaluation of acute chest pain and discuss tips for successful implementation of CTA in the emergency department.
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Affiliation(s)
- Michael K Cheezum
- Departments of Medicine and Radiology (Cardiovascular Division), Brigham and Women's Hospital, Non-Invasive Cardiovascular Imaging Program, Boston, MA, USA
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Patel AR, Bhave NM, Mor-Avi V. Myocardial perfusion imaging with cardiac computed tomography: state of the art. J Cardiovasc Transl Res 2013; 6:695-707. [PMID: 23963959 DOI: 10.1007/s12265-013-9499-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 07/07/2013] [Indexed: 10/26/2022]
Abstract
Cardiac computed tomography (CCT) has become an important tool for the anatomic assessment of patients with suspected coronary disease. Its diagnostic accuracy for detecting the presence of underlying coronary artery disease and ability to risk stratify patients are well documented. However, the role of CCT for the physiologic assessment of myocardial perfusion during resting and stress conditions is only now emerging. With the addition of myocardial perfusion imaging to coronary imaging, CCT has the potential to assess both coronary anatomy and its functional significance with a single non-invasive test. In this review, we discuss the current state of CCT myocardial perfusion imaging for the detection of myocardial ischemia and myocardial infarction and examine its complementary role to CCT coronary imaging.
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Affiliation(s)
- Amit R Patel
- Department of Medicine, Section of Cardiology, Cardiac Imaging Center, University of Chicago, Medical Center, 5841 South Maryland Avenue, MC5084, Chicago, IL, 60637, USA,
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Diagnostic performance of resting CT myocardial perfusion in patients with possible acute coronary syndrome. AJR Am J Roentgenol 2013; 200:W450-7. [PMID: 23617513 DOI: 10.2214/ajr.12.8934] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE Coronary CT angiography has high sensitivity, but modest specificity, to detect acute coronary syndrome. We studied whether adding resting CT myocardial perfusion imaging improved the detection of acute coronary syndrome. SUBJECTS AND METHODS Patients with low-to-intermediate cardiac risk presenting with possible acute coronary syndrome received both the standard of care evaluation and a research thoracic 64-MDCT examination. Patients with an obstructive (> 50%) stenosis or a nonevaluable coronary segment on CT were diagnosed with possible acute coronary syndrome. CT perfusion was determined by applying gray and color Hounsfield unit maps to resting CT angiography images. Adjudicated patient diagnoses were based on the standard of care and 3-month follow-up. Patient-level diagnostic performance for acute coronary syndrome was calculated for coronary CT, CT perfusion, and combined techniques. RESULTS A total of 105 patients were enrolled. Of the nine (9%) patients with acute coronary syndrome, all had obstructive CT stenoses but only three had abnormal CT perfusion. CT perfusion was normal in all other patients. To detect acute coronary syndrome, CT angiography had 100% sensitivity, 89% specificity, and a positive predictive value of 45%. For CT perfusion, specificity and positive predictive value were each 100%, and sensitivity was 33%. Combined cardiac CT and CT perfusion had similar specificity but a higher positive predictive value (100%) than did CT angiography. CONCLUSION Resting CT perfusion using CT angiographic images may have high specificity and may improve CT positive predictive value for acute coronary syndrome without added radiation and contrast. However, normal resting CT perfusion cannot exclude acute coronary syndrome.
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Outcomes After Coronary Computed Tomography Angiography in the Emergency Department. J Am Coll Cardiol 2013; 61:880-92. [DOI: 10.1016/j.jacc.2012.11.061] [Citation(s) in RCA: 186] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 10/06/2012] [Accepted: 11/08/2012] [Indexed: 12/12/2022]
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Is it prime time for "rapid comprehensive cardiopulmonary imaging" in the emergency department? Cardiol Clin 2012; 30:523-32. [PMID: 23102029 DOI: 10.1016/j.ccl.2012.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Reducing hospital admissions through improved risk stratification of patients with potential acute coronary syndrome represents a critical focus for reducing health care expenditure. Coronary computed tomographic angiography (CTA) has been used with increasing frequency as part of the evaluation of chest pain in the Emergency Department. In the appropriate group of patients at low to intermediate risk CTA appears to be an excellent evaluation strategy, safely and efficiently allowing for the rapid discharge of patients home.
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