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Kim W, Kwak JG, Cho S, Kim WH. Ten-year follow-up of dilatation of aortic structures in Fallot-type anomalies. Pediatr Cardiol 2023; 44:1552-1559. [PMID: 37405457 DOI: 10.1007/s00246-023-03225-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 06/28/2023] [Indexed: 07/06/2023]
Abstract
OBJECTIVES Dilatation of the aortic root structures or ascending aorta is often observed in patients with Fallot-type anomalies. We aimed to determine the dilation rate of the aortic structures and investigate strategies for managing this phenomenon. METHODS In this retrospective study, we enrolled 66 out of 801 patients who underwent corrective surgery for Fallot-type anomalies (tetralogy of Fallot [TOF] and Fallot-type double outlet right ventricle [DORV]) between 2004 and 2020. These 66 patients had follow-up cardiac computed tomography (CT) angiography images taken at least 5 years after the initial CT study. We analyzed the diameters and aortic cross-sectional area/height ratio (AH) of the aortic annulus, sinus of Valsalva, sinotubular junction, and ascending aorta between the initial and follow-up CT scans. "Dilatation" was defined as a z-score over 2 for each aortic structure. RESULTS The median age at the initial and follow-up CT scans was 5.9 years (interquartile range [IQR]: 0.4 ~ 12.4) and 15.9 years (IQR 9.3 ~ 23.4), respectively. The median CT interval (from initial to latest CT) was 9.5 years (IQR 6.6 ~ 12.0). The sinus of Valsalva exhibited the most significant dilation (32.8 mm at follow-up CT) over the study period. The AH ratio increased significantly in all four aortic structures. The patient's age was significantly associated with higher AH in the follow-up CT. Aortic dilatation was present in 74.2% of patients at the initial CT and increased to 86.4% at the follow-up CT. CONCLUSION In Fallot-type anomalies, the AH ratio of aortic root structures significantly increased over an average period of approximately 9.5 years. The number of patients diagnosed with aortic dilatation also increased. Based on our observations in this study, these patients' group should be considered for more frequent follow-up examinations, as significant dilatation could occur in their mid-20 s.
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Affiliation(s)
- Woojung Kim
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Seoul National University Children's Hospital, Seoul National University, 101 Daehak-Ro, Chongno-Gu, Seoul, 03080, Republic of Korea
- Department of Thoracic and Cardiovascular Surgery, Korean Armed Forces Capital Hospital, Seongnam, Republic of Korea
| | - Jae Gun Kwak
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Seoul National University Children's Hospital, Seoul National University, 101 Daehak-Ro, Chongno-Gu, Seoul, 03080, Republic of Korea.
| | - Sungkyu Cho
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Seoul National University Children's Hospital, Seoul National University, 101 Daehak-Ro, Chongno-Gu, Seoul, 03080, Republic of Korea
| | - Woong-Han Kim
- Department of Thoracic and Cardiovascular Surgery, College of Medicine, Seoul National University Children's Hospital, Seoul National University, 101 Daehak-Ro, Chongno-Gu, Seoul, 03080, Republic of Korea
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Masuda T, Funama Y, Nakaura T, Sato T, Oku T, Gotanda R, Arao K, Imaizumi H, Arao S, Ono A, Hiratsuka J, Awai K. Usefulness of electrocardiogram mA modulation during the electrocardiogram-gated CT scan in paediatrics with high heart rate for different helical pitch: a phantom-based assessment study. RADIATION PROTECTION DOSIMETRY 2023:ncad180. [PMID: 37337642 DOI: 10.1093/rpd/ncad180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 04/08/2023] [Accepted: 05/29/2023] [Indexed: 06/21/2023]
Abstract
We investigated the effect of electrocardiographic (ECG) mA-modulation of ECG-gated scans of computed tomography (CTA) on radiation dose and image noise at high heart rates (HR) above 100 bpm between helical pitches (HP) 0.16 and 0.24. ECG mA-modulation range during ECG-gated CTA is 50-100 mA, the phase setting is 40-60% and the scan range is 90 mm for clinical data during HR for 90, 120 and 150 bpm. Radiation dose and image noise in Housfield units are measured for CT equipment during HR for 90, 120 and 150 bpm between HP 0.16 and 0.24. ECG mA-modulation, dose reduction ratio for HR 90, 120 and 150 bpm are 19.1, 13.4 and 8.7% at HP 0.16 and 17.1, 13.3 and 7.7% at HP 0.24, respectively. No significant differences were observed in image noise between both HP. Dose reductions of 8-24% are achieved with ECG mA-modulation during ECG-gated CCTA scan, which is beneficial even in high HR more than 100 bpm.
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Affiliation(s)
- Takanori Masuda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Yoshinori Funama
- Department of Medical Physics, Faculty of Life Sciences, Kumamoto University, Kumamoto 860-8555, Japan
| | - Takeshi Nakaura
- Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Kumamoto 860-8556, Japan
| | - Tomoyasu Sato
- Department of Diagnostic Radiology, Tsuchiya General Hospital, Nakajima-cho 3-30, Hiroshima 730-8655, Japan
| | - Takayuki Oku
- Department of Radiological Technologist, Tsuchiya General Hospital, Nakajima-cho 3-30, Hiroshima 730-8655, Japan
| | - Rumi Gotanda
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Keiko Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Hiromasa Imaizumi
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Shinichi Arao
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Atsushi Ono
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Junichi Hiratsuka
- Department of Radiological Technology, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, 288 Matsushima, Kurashiki City 701-0193 Japan
| | - Kazuo Awai
- Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 739-0046, Japan
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Chuang PH, Lin MT, Huang SC, Chen YS, Wu MH, Chen SJ. Computed tomography jellyfish angiography in pediatric endovascular interventions. J Formos Med Assoc 2023; 122:427-431. [PMID: 36609102 DOI: 10.1016/j.jfma.2022.12.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 11/27/2022] [Accepted: 12/19/2022] [Indexed: 01/06/2023] Open
Abstract
Contrast pooling (CP) reconstruction is widely used in computed tomography (CT) studies of congenital heart diseases. However, endovascular devices are usually obscured in CP. To improve visualization of the vascular lumen, we developed jellyfish angiography (JFA), a semitransparent blood pool inversion technique. Ten CT studies of patent ductus arteriosus (PDA) or coarctation of the aorta (CoA) were selected retrospectively for reconstruction using both CP and JFA. Four of the studies were conducted before the endovascular intervention, and six were conducted after the intervention. Radiology residents and pediatric cardiologists completed questionnaires regarding the reconstruction models. For radiology residents, JFA was superior to CP in postintervention PDA diagnosis, device evaluation, and overall satisfaction. For pediatric cardiologists, JFA outperformed CP in both PDA and CoA postintervention cases. Our findings show that JFA overcomes the disadvantages of CP and can improve the visualization of intraluminal devices which is essential for endovascular treatment evaluation.
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Affiliation(s)
- Po-Han Chuang
- Department of Medical Imaging, National Taiwan University Hospital, No.7, Zhongshan S. Rd., Zhongzheng Dist., Taipei City 10002, Taiwan
| | - Ming-Tai Lin
- Department of Pediatrics, National Taiwan University Children Hospital, No.8, Zhongshan S. Rd., Zhongzheng Dist., Taipei City, Taiwan
| | - Shu-Chien Huang
- Department of Surgery, National Taiwan University Hospital, No.7, Zhongshan S. Rd., Zhongzheng Dist., Taipei City, Taiwan
| | - Yih-Sharng Chen
- Department of Surgery, National Taiwan University Hospital, No.7, Zhongshan S. Rd., Zhongzheng Dist., Taipei City, Taiwan
| | - Mei-Hwan Wu
- Department of Pediatrics, National Taiwan University Children Hospital, No.8, Zhongshan S. Rd., Zhongzheng Dist., Taipei City, Taiwan
| | - Shyh-Jye Chen
- Department of Medical Imaging, National Taiwan University Hospital, No.7, Zhongshan S. Rd., Zhongzheng Dist., Taipei City 10002, Taiwan.
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Diagnostic Validity and Reliability of Low-Dose Prospective ECG-Triggering Cardiac CT in Preoperative Assessment of Complex Congenital Heart Diseases (CHDs). CHILDREN (BASEL, SWITZERLAND) 2022; 9:children9121903. [PMID: 36553346 PMCID: PMC9776829 DOI: 10.3390/children9121903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/01/2022] [Accepted: 12/02/2022] [Indexed: 12/12/2022]
Abstract
For the precise preoperative evaluation of complex congenital heart diseases (CHDs) with reduced radiation dose exposure, we assessed the diagnostic validity and reliability of low-dose prospective ECG-gated cardiac CT (CCT). Forty-two individuals with complex CHDs who underwent preoperative CCT as part of a prospective study were included. Each CCT image was examined independently by two radiologists. The primary reference for assessing the diagnostic validity of the CCT was the post-operative data. Infants and neonates were the most common age group suffering from complex CHDs. The mean volume of the CT dose index was 1.44 ± 0.47 mGy, the mean value of the dose-length product was 14.13 ± 5.4 mGy*cm, and the mean value of the effective radiation dose was 0.58 ± 0.13 mSv. The sensitivity, specificity, PPV, NPV, and accuracy of the low-dose prospective ECG-gated CCT for identifying complex CHDs were 95.6%, 98%, 97%, 97%, and 97% for reader 1 and 92.6%, 97%, 95.5%, 95.1%, and 95.2% for reader 2, respectively. The overall inter-reader agreement for interpreting the cardiac CCTs was good (κ = 0.74). According to the results of our investigation, low-dose prospective ECG-gated CCT is a useful and trustworthy method for assessing coronary arteries and making a precise preoperative diagnosis of complex CHDs.
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Dynamic cardiac computed tomography characteristics of double-chambered right ventricle. Sci Rep 2022; 12:20607. [PMID: 36446892 PMCID: PMC9708647 DOI: 10.1038/s41598-022-25230-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 11/28/2022] [Indexed: 12/02/2022] Open
Abstract
To introduce image characteristics of double-chambered right ventricle on cardiac computed tomography and set a diagnostic criterion for the diagnosis. We retrospectively collected and measured the right ventricular constrictive ratio on computed tomography images in children who had simple ventricular septal defects in the past 10 years, because double-chambered right ventricle is often associated with ventricular septal defects. The right ventricular constrictive ratio was defined as the subinfundibular cross-sectional intraluminal area during end-systole divided by the area during end-diastole in the same patient. We compared the right ventricular constrictive ratio between subjects with concomitant double-chambered right ventricle and those without. 52 children were included, and 23 (44.2%) of them have concomitant double-chambered right ventricle. In most cases (n = 21; 91.3%), the hypertrophied muscular bundles occur just inferior to the level of the supraventricular crest in the right ventricle. Mean right ventricular constrictive ratio in patients with double-chambered right ventricle (15%) was significantly smaller than that without (29%). A cut-off value of a right ventricular constrictive ratio less than 20.1% was established to diagnose double-chambered right ventricle with an 89.7% sensitivity and 78. 3% specificity. Right ventricular constrictive ratio can be a valuable asset for the preoperative diagnosis of double-chambered right ventricle with cardiac computed tomography.
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Kumar P, Bhatia M. Role of CT in the Pre- and Postoperative Assessment of Conotruncal Anomalies. Radiol Cardiothorac Imaging 2022; 4:e210089. [PMID: 35923747 PMCID: PMC9308465 DOI: 10.1148/ryct.210089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/25/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
Conotruncal anomalies, also referred to as outflow tract anomalies, are congenital heart defects that result from abnormal septation of the great vessels' outflow tracts. The major conotruncal anomalies include tetralogy of Fallot, double-outlet right ventricle, transposition of the great arteries, truncus arteriosus, and interrupted aortic arch. Other defects, which are often components of the major anomalies, include pulmonary atresia with ventricular septal defect, pulmonary valve agenesis, aortopulmonary window, and double-outlet left ventricle. CT has emerged as a robust diagnostic tool in preoperative and postoperative assessment of various congenital heart diseases, including conotruncal anomalies. The data provided with multidetector CT imaging are useful for treatment planning and follow-up monitoring after surgery or intervention. Unlike echocardiography and MRI, CT is not limited by a small acoustic window, metallic devices, and need for sedation or anesthesia. Major advances in CT equipment, including dual-source scanners, wide-detector scanners, high-efficiency detectors, higher x-ray tube power, automatic tube current modulation, and advanced three-dimensional postprocessing, provide a low-risk, high-quality alternative to diagnostic cardiac catheterization and MRI. This review explores the various conotruncal anomalies and elucidates the role of CT imaging in their pre- and postoperative assessment. Keywords: CT, CT Angiography, Stents, Pediatrics © RSNA, 2022.
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Affiliation(s)
- Parveen Kumar
- Department of Radiodiagnosis and Imaging, Fortis Escort Heart Institute, Okhla Road, New Delhi 110025, India
| | - Mona Bhatia
- Department of Radiodiagnosis and Imaging, Fortis Escort Heart Institute, Okhla Road, New Delhi 110025, India
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Malone LJ, Morin CE, Browne LP. Coronary computed tomography angiography in children. Pediatr Radiol 2022; 52:2498-2509. [PMID: 34734316 PMCID: PMC8566193 DOI: 10.1007/s00247-021-05209-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/16/2021] [Accepted: 09/10/2021] [Indexed: 12/17/2022]
Abstract
Imaging the coronary arteries of children, with their faster heart rates, small vessel size and common inability to lie still or breath-hold, has been a major challenge. With numerous advances in technology, CT examinations can now be performed quickly, often with children free-breathing and with much lower radiation doses than previously. This has led to increased use in children. Care must be taken with technique and choice of electrocardiogram (ECG)-gating technique to obtain adequate imaging for a diagnosis while keeping radiation dose as low as reasonably achievable (ALARA). In this paper, we discuss techniques and tips for CT imaging of the coronary arteries in children, including use of dual-source- and ultrawide-detector CT scanners.
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Affiliation(s)
- LaDonna J Malone
- Department of Radiology, University of Colorado, Aurora, CO, USA.
- Department of Radiology, Children's Hospital of Colorado, 13123 E. 16th Ave., B125, Aurora, CO, 80045, USA.
| | - Cara E Morin
- Department of Diagnostic Imaging, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Lorna P Browne
- Department of Radiology, University of Colorado, Aurora, CO, USA
- Department of Radiology, Children's Hospital of Colorado, 13123 E. 16th Ave., B125, Aurora, CO, 80045, USA
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8
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Kumar P, Bhatia M. Role of Computed Tomography in Pre- and Postoperative Evaluation of a Double-Outlet Right Ventricle. J Cardiovasc Imaging 2021; 29:205-227. [PMID: 34080329 PMCID: PMC8318812 DOI: 10.4250/jcvi.2020.0196] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/20/2020] [Accepted: 01/05/2021] [Indexed: 01/22/2023] Open
Abstract
Double-outlet right ventricle (DORV) is a type of ventriculoarterial connection in which both great arteries arise entirely or predominantly from the right ventricle. The morphology of DORV is characterized by a ventricular septal defect (location and relationship with the semilunar valve); bilateral coni and aortomitral continuity; the presence or absence of outflow tract obstruction; tricuspid-pulmonary annular distance; and associated cardiac anomalies. The surgical approach varies with the type of DORV and is based on multiple variables. Computed tomography (CT) is a robust diagnostic tool for the preoperative and postoperative assessment of DORV. Unlike echocardiography and magnetic resonance imaging (MRI), CT imaging is not limited by small acoustic window, need for anaesthesia and can be used in patients with metallic implants. Current generations CT scanners with high spatial and temporal resolution, wide detectors, high-pitch scanning mode, dose-reduction algorithms, and advanced three-dimensional post-processing tools provide a low-risk, high-quality alternative to diagnostic cardiac catheterization or MRI, and have been increasingly utilized in nearly every type of congenital heart defect, including DORV.
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Affiliation(s)
- Parveen Kumar
- Department of Radiodiagnosis and Imaging, Fortis Escort Heart Institute, New Delhi, India.
| | - Mona Bhatia
- Department of Radiodiagnosis and Imaging, Fortis Escort Heart Institute, New Delhi, India.,Cardiological Society of India, Kolkata, India.,International Regional Committee, India Chapter of the Society of Cardiovascular Computed Tomography, New Delhi, India
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Wang B, Huang LT, Hsieh ML, Wang CK, Wang JN, Kan CD, Wu JM, Tsai YS. Diastolic and systolic right ventricular diameters for predicting pulmonary hypertension in children with congenital heart disease. Clin Imaging 2020; 70:67-73. [PMID: 33125987 DOI: 10.1016/j.clinimag.2020.10.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 09/24/2020] [Accepted: 10/14/2020] [Indexed: 11/25/2022]
Abstract
Prospective electrocardiography (ECG)-gated cardiac computed tomography angiography (CTA) is widely used for pediatric patients with congenital heart disease (CHD) due to the lower radiation dose compared with the ECG-gated technique. However, functional parameters acquired using ECG-gated cardiac CT to predict pulmonary hypertension (PH) in children with CHD have not yet been reported. This study aimed to investigate the potential of diastolic and systolic right ventricular diameters (RVD) on prospective ECG-gated cardiac CTA to predict PH in children with CHD. A total of 44 children with CHD were divided into two groups: CHD with PH (n = 22) and CHD without PH (n = 22). The association between ECG-gated CTA parameters and PH was evaluated by logistic regression. The receiver operating characteristic curve (ROC) was used to find the best cut-off point for the parameters measured by Youden's index. Patients with higher RVD-BSA [aOR (95% CI) diastolic: 2.76 (1.23-6.23); systolic: 6.15 (1.72-22.06)] had higher risk of PH after adjusting for age and patent ductus arteriosus. The area under the curve (AUC) of D-RVD-BSA was 0.907 and the AUC of S-RVD-BSA was 0.917. Logistic regression showed that patients with D-RVD-BSA over 6.86 or S-RVD-BSA over 5.87 had significantly higher risk of PH after adjustments (aOR = 23.52, 95% CI = 2.89-191.03; aOR = 31.14, 95% CI = 2.75-352.85). In conclusion, in children with CHD, measurements of diastolic or systolic BSA-modified RVDs on prospective ECG-gated CTA are non-invasive markers of PH. BSA-modified D-RVD of 6.86 or BSA-modified S-RVD of 5.87 may be used to identify PH in children with CHD.
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Affiliation(s)
- Bow Wang
- Departments of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Li-Ting Huang
- Departments of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Min-Ling Hsieh
- Departments of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chien-Kuo Wang
- Departments of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Jieh-Neng Wang
- Departments of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Chung-Dann Kan
- Department of Surgery and Institute of Cardiovascular Research Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Jing-Ming Wu
- Departments of Pediatrics, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Yi-Shan Tsai
- Departments of Diagnostic Radiology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
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Malone LJ, Olson A, Barker AJ, Mong DA, Weinman JP, Browne LP. Visualization of proximal coronary arteries on high-pitch electrocardiogram-triggered computed tomography in pediatric congenital heart disease: effects of heart rate and body surface area. Pediatr Radiol 2020; 50:1375-1380. [PMID: 32696109 DOI: 10.1007/s00247-020-04730-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 04/20/2020] [Accepted: 05/20/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND As CT technology has advanced, techniques for pediatric cardiac CT in congenital heart disease have evolved from retrospective electrocardiography (ECG)-gating with relatively high radiation doses to lower-dose prospective ECG-gating and even single-beat gated scans. Despite these advances, coronary artery imaging in children remains challenging because of their small vessel size and high heart rates, often necessitating retrospective gating. OBJECTIVE Evaluate coronary artery visualization in pediatric patients (<20 years) who underwent low-dose high-pitch ECG-triggered scans and stratify the probability of coronary artery visualization based upon heart rate and body surface area (BSA). MATERIALS AND METHODS Two hundred eleven high-pitch ECG-triggered studies from April 2014 to November 2017 were reviewed by two pediatric cardiac imagers in this retrospective study. Patient age, gender, BSA, average heart rate, heart rate variability and use of general anesthesia were recorded as well as dose-length product (DLP) and volumetric CT dose index (CTDIvol). We assessed the coronary artery score using a 5-point scale, with score of ≥3 considered of diagnostic quality. We performed multivariate statistical analysis including logistic regression to analyze effects of heart rate and BSA. RESULTS Patient age range was 1 day to 19 years (median age 3 years). Heart rate range was 49-188 beats per minute (bpm; median 122 bpm) and BSA range was 0.15-2.07 m2 (median 0.53 m2). The origin and proximal coronary arteries were confidently seen (score ≥3) in 61% of studies in this cohort. Coronary artery visualization scores further increased with increased BSA (P<0.002) and with decreased heart rate (P<0.001). At heart rates <100 bpm or in patients with BSA>0.58, adequate coronary artery visualization was present 72% of the time. CONCLUSION While in many patients the coronary artery origins are visualized using high-pitch ECG-triggered technique, the importance of coronary artery visualization needs to be weighed with the radiation dose penalty in individual patients to achieve optimal imaging.
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Affiliation(s)
- LaDonna J Malone
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA. .,Children's Hospital of Colorado, Aurora, CO, USA.
| | - Andrew Olson
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA
| | - Alex J Barker
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA.,Department of Bioengineering, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - David Andrew Mong
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA.,Children's Hospital of Colorado, Aurora, CO, USA
| | - Jason P Weinman
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA.,Children's Hospital of Colorado, Aurora, CO, USA
| | - Lorna P Browne
- Department of Radiology, University of Colorado School of Medicine, 12401 E. 17th Ave., L954, Aurora, CO, 80045, USA.,Children's Hospital of Colorado, Aurora, CO, USA
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Chen SJ, Huang JH, Lee WJ, Lin MT, Chen YS, Wang JK. Diagnosis of Pulmonary Arterial Hypertension in Children by Using Cardiac Computed Tomography. Korean J Radiol 2020; 20:976-984. [PMID: 31132823 PMCID: PMC6536789 DOI: 10.3348/kjr.2018.0673] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 02/02/2019] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE To establish diagnostic criteria for pulmonary arterial hypertension (PAH) in children by using parameters obtained through noninvasive cardiac computed tomography (CCT). MATERIALS AND METHODS We retrospectively measured parameters from CCT images of children from a single institution in a multiple stepwise process. A total of 208 children with mean age of 10.5 years (range: 4 days-18.9 years) were assessed. The variables were classified into three groups: the great arteries; the ventricular walls; and the bilateral ventricular cavities. The relationship between the parameters obtained from the CCT images and mean pulmonary arterial pressure (mPAP) was tested and adjusted by the children's body size. Reference curves for the pulmonary trunk diameter (PTD) and ratio of diameter of pulmonary trunk to ascending aorta (rPTAo) of children with CCT images of normal hearts, adjusted for height, were plotted. Threshold lines were established on the reference curves. RESULTS PTD and rPTAo on the CCT images were significantly positively correlated with mPAP (r > 0.85, p < 0.01). Height was the body size parameter most correlated with PTD (r = 0.91, p < 0.01) and rPTAo (r = -0.69, p < 0.01). On the basis of the threshold lines on the reference curves, PTD and rPTAo both showed 88.9% sensitivity for PAH diagnosis, with negative predictive values of 93.3% and 92.9%, respectively. CONCLUSION PTD and rPTAo measured from CCT images were significantly correlated with mPAP in children. Reference curves and the formula of PTD and rPTAo adjusted for height could be practical for diagnosing PAH in children.
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Affiliation(s)
- Shyh Jye Chen
- Department of Radiology and Medical Imaging, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan
| | - Jou Hsuan Huang
- Department of Radiology and Medical Imaging, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan
| | - Wen Jeng Lee
- Department of Radiology and Medical Imaging, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan
| | - Ming Tai Lin
- Department of Pediatrics, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan.
| | - Yih Sharng Chen
- Department of Surgery, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan
| | - Jou Kou Wang
- Department of Pediatrics, National Taiwan University Hospital, Medical College, National Taiwan University, Taipei, Taiwan
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Image quality and radiation dose of different scanning protocols in DSCT cardiothoracic angiography for children with tetralogy of fallot. Int J Cardiovasc Imaging 2020; 36:1791-1799. [PMID: 32419092 DOI: 10.1007/s10554-020-01882-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 05/13/2020] [Indexed: 10/24/2022]
Abstract
The aim of this study was to investigate the image quality and radiation dose of different scanning protocols in dual-source CT cardiothoracic angiography for children with tetralogy of Fallot (TOF). Seventy-five consecutive children with known or suspected TOF were enrolled to undergo prospective ECG-triggering sequential dual-source CT (DSCT) cardiothoracic angiography. According to the scanning protocols, these patients were randomly divided into 3 groups: fixed delay time (FDT, n = 25, group A), automatic bolus-tracking (ABT, n = 25, group B) and manual bolus-tracking (MBT, n = 25, group C). Subjective and objective image quality were evaluated. The radiation doses were recorded. The image quality scores of group C were significantly higher than those of group A and B. The absolute value of difference (D-value) on CT attenuation between left (CTLV) and right ventricle (CTRV) in group C was significantly lower than that in group A and B. The total effective dose of groups A, B and C were 0.39 ± 0.06 mSv, 0.40 ± 0.07 mSv and 0.40 ± 0.08 mSv, respectively. There was no significant difference among 3 groups (P = 0.722). Scanning protocol has significantly impacts on the image quality of cardiovascular structures for TOF patients. Compared with the conventional scanning protocols FDT and ABT, the MBT technique provides high image quality and achieves more homogenous attenuation among different patients with TOF.
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Hong SH, Goo HW, Maeda E, Choo KS, Tsai IC. User-Friendly Vendor-Specific Guideline for Pediatric Cardiothoracic Computed Tomography Provided by the Asian Society of Cardiovascular Imaging Congenital Heart Disease Study Group: Part 1. Imaging Techniques. Korean J Radiol 2019; 20:190-204. [PMID: 30672159 PMCID: PMC6342752 DOI: 10.3348/kjr.2018.0571] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 09/30/2018] [Indexed: 12/13/2022] Open
Abstract
Optimal performance of pediatric cardiothoracic computed tomography (CT) is technically challenging and may need different approaches for different types of CT scanners. To meet the technical demands and improve clinical standards, a practical, user-friendly, and vendor-specific guideline for pediatric cardiothoracic CT needs to be developed for children with congenital heart disease (CHD). In this article, we have attempted to describe such guideline based on the consensus of experts in the Asian Society of Cardiovascular Imaging CHD Study Group. This first part describes the imaging techniques of pediatric cardiothoracic CT, and it includes recommendations for patient preparation, scan techniques, radiation dose, intravenous injection protocol, post-processing, and vendor-specific protocols.
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Affiliation(s)
- Sun Hwa Hong
- Department of Radiology, Mediplex Sejong Hospital, Incheon, Korea
| | - Hyun Woo Goo
- Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
| | - Eriko Maeda
- Department of Radiology, The University of Tokyo, Tokyo, Japan
| | - Ki Seok Choo
- Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea
| | - I Chen Tsai
- Congenital Heart Disease Study Group Member of the Asian Society of Cardiovascular Imaging, Taiwan
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Optimizing Cardiac CTA Acquisition in Congenital Heart Disease. CURRENT RADIOLOGY REPORTS 2018. [DOI: 10.1007/s40134-018-0294-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Combined prospectively electrocardiography- and respiratory-triggered sequential cardiac computed tomography in free-breathing children: success rate and image quality. Pediatr Radiol 2018; 48:923-931. [PMID: 29589058 DOI: 10.1007/s00247-018-4114-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 02/06/2018] [Accepted: 03/11/2018] [Indexed: 10/17/2022]
Abstract
BACKGROUND Combined prospectively electrocardiography (ECG)- and respiratory-triggered sequential cardiac computed tomography (CT) has not been evaluated in free-breathing children. OBJECTIVE To evaluate the success rate and image quality of combined prospectively ECG- and respiratory-triggered sequential cardiac CT in free-breathing children. MATERIALS AND METHODS Image quality of combined prospectively ECG- and respiratory-triggered sequential cardiac CT in 870 children (≤5 years of age) was evaluated in terms of severe motion (maximal distance ≥2 mm) and band artifacts (maximal attenuation difference ≥100 Hounsfield units). The success rate of the scan mode was calculated. The causes of failed cases were assessed. Patient-related, radiation and image quality parameters were compared between success and failure groups. RESULTS Severe motion artifacts were observed in 10.6% (92/870) of patients due to cardiac phase error in 17 (18.5%), patient motion in 12 (13.0%), and unknown causes in 63 (68.5%). Severe band artifacts were seen in 13.2% (115/870) of patients. Combined prospectively ECG- and respiratory-triggered sequential cardiac CT was successfully performed in 78.5% (683/870) of patients, while it failed in 21.5% (187/870). All the evaluated patient-related, radiation and image quality parameters were significantly different (P≤0.001) between success and failure groups except effective dose (P>0.05). CONCLUSION Additional prospective respiratory triggering can reduce motion artifacts in prospectively ECG-triggered sequential cardiac CT in free-breathing children.
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Zhang W, Bogale S, Golriz F, Krishnamurthy R. Relationship between heart rate and quiescent interval of the cardiac cycle in children using MRI. Pediatr Radiol 2017; 47:1588-1593. [PMID: 28744611 DOI: 10.1007/s00247-017-3918-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 05/08/2017] [Accepted: 06/02/2017] [Indexed: 10/19/2022]
Abstract
BACKGROUND Imaging the heart in children comes with the challenge of constant cardiac motion. A prospective electrocardiography-triggered CT scan allows for scanning during a predetermined phase of the cardiac cycle with least motion. This technique requires knowing the optimal quiescent intervals of cardiac cycles in a pediatric population. OBJECTIVE To evaluate high-temporal-resolution cine MRI of the heart in children to determine the relationship of heart rate to the optimal quiescent interval within the cardiac cycle. MATERIALS AND METHODS We included a total of 225 consecutive patients ages 0-18 years who had high-temporal-resolution cine steady-state free-precession sequence performed as part of a magnetic resonance imaging (MRI) or magnetic resonance angiography study of the heart. We determined the location and duration of the quiescent interval in systole and diastole for heart rates ranging 40-178 beats per minute (bpm). We performed the Wilcoxon signed rank test to compare the duration of quiescent interval in systole and diastole for each heart rate group. RESULTS The duration of the quiescent interval at heart rates <80 bpm and >90 bpm was significantly longer in diastole and systole, respectively (P<.0001 for all ranges, except for 90-99 bpm [P=.02]). For heart rates 80-89 bpm, diastolic interval was longer than systolic interval, but the difference was not statistically significant (P=.06). We created a chart depicting optimal quiescent intervals across a range of heart rates that could be applied for prospective electrocardiography-triggered CT imaging of the heart. CONCLUSION The optimal quiescent interval at heart rates <80 bpm is in diastole and at heart rates ≥90 bpm is in systole. The period of quiescence at heart rates 80-89 bpm is uniformly short in systole and diastole.
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Affiliation(s)
- Wei Zhang
- E. B. Singleton Department of Pediatric Radiology, Texas Children's Hospital, 6701 Fannin St., Houston, TX, 77030, USA.
| | - Saivivek Bogale
- Department of Radiology, Baylor University Medical Center, Dallas, TX, USA
| | - Farahnaz Golriz
- Department of Radiology, Baylor College of Medicine, Houston, TX, USA
| | - Rajesh Krishnamurthy
- Department of Diagnostic Radiology, Nationwide Children's Hospital, Columbus, OH, USA
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Singhal M, Singh S, Gupta P, Sharma A, Khandelwal N, Burns JC. Computed Tomography Coronary Angiography for Evaluation of Children With Kawasaki Disease. Curr Probl Diagn Radiol 2017; 47:238-244. [PMID: 29203262 DOI: 10.1067/j.cpradiol.2017.09.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 09/26/2017] [Accepted: 09/27/2017] [Indexed: 12/15/2022]
Abstract
OBJECTIVE We sought to assess the feasibility of computed tomography coronary angiography (CTCA) on a 128-slice, dual source scanner in children with acute and convalescent phase Kawasaki disease (KD). MATERIALS AND METHODS A prospective study of 49 children with KD (12 at presentation and 37 in the convalescent phase) was conducted between November 2013 and April 2015. CTCA was performed with either prospective (n = 37) or retrospective (n = 12) electrocardiographic gating. A radiologist blinded to clinical profile and echocardiogram evaluated each scan. RESULTS Median age (36 boys and 13 girls) was 7 years. Median dose-length product value and median effective CT radiation dose was 32mGycm (interquartile range [IQR]: 21-74) and 0.54 miliSieverts (mSv) (IQR: 0.77-3.2) for all scans, and 27mGycm (IQR: 18.5-33.75) and 0.48mSv (IQR: 0.18-1.17) for prospectively triggered scans (n = 37). Fourteen subjects (30 coronary segments) showed abnormalities by CTCA including aneurysms (n = 27) and stenoses (n = 3). In the acute phase (n = 12), aneurysms were detected in 5 children (18 segments). CONCLUSION CTCA allows comprehensive evaluation of coronary arteries in children with KD.
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Affiliation(s)
- Manphool Singhal
- Department of Radiodiagnosis and Imaging, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
| | - Surjit Singh
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Pankaj Gupta
- Department of Radiodiagnosis and Imaging, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Avinash Sharma
- Department of Pediatrics, Advanced Pediatrics Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Niranjan Khandelwal
- Department of Radiodiagnosis and Imaging, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Jane C Burns
- Department of Pediatrics, University of California San Diego (UCSD) School of Medicine and Rady Children's Hospital San Diego, La Jolla, CA
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Assessment of coronary artery by prospective ECG-triggered 256 multi-slice CT on children with congenital heart disease. Int J Cardiovasc Imaging 2017; 33:2021-2028. [DOI: 10.1007/s10554-017-1150-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 12/07/2016] [Indexed: 11/26/2022]
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Shirota G, Maeda E, Namiki Y, Bari R, Ino K, Torigoe R, Abe O. Pediatric 320-row cardiac computed tomography using electrocardiogram-gated model-based full iterative reconstruction. Pediatr Radiol 2017; 47:1463-1470. [PMID: 28667349 PMCID: PMC5608791 DOI: 10.1007/s00247-017-3901-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 04/05/2017] [Accepted: 05/09/2017] [Indexed: 12/03/2022]
Abstract
BACKGROUND Full iterative reconstruction algorithm is available, but its diagnostic quality in pediatric cardiac CT is unknown. OBJECTIVE To compare the imaging quality of two algorithms, full and hybrid iterative reconstruction, in pediatric cardiac CT. MATERIALS AND METHODS We included 49 children with congenital cardiac anomalies who underwent cardiac CT. We compared quality of images reconstructed using the two algorithms (full and hybrid iterative reconstruction) based on a 3-point scale for the delineation of the following anatomical structures: atrial septum, ventricular septum, right atrium, right ventricle, left atrium, left ventricle, main pulmonary artery, ascending aorta, aortic arch including the patent ductus arteriosus, descending aorta, right coronary artery and left main trunk. We evaluated beam-hardening artifacts from contrast-enhancement material using a 3-point scale, and we evaluated the overall image quality using a 5-point scale. We also compared image noise, signal-to-noise ratio and contrast-to-noise ratio between the algorithms. RESULTS The overall image quality was significantly higher with full iterative reconstruction than with hybrid iterative reconstruction (3.67±0.79 vs. 3.31±0.89, P=0.0072). The evaluation scores for most of the gross structures were higher with full iterative reconstruction than with hybrid iterative reconstruction. There was no significant difference between full and hybrid iterative reconstruction for the presence of beam-hardening artifacts. Image noise was significantly lower in full iterative reconstruction, while signal-to-noise ratio and contrast-to-noise ratio were significantly higher in full iterative reconstruction. CONCLUSION The diagnostic quality was superior in images with cardiac CT reconstructed with electrocardiogram-gated full iterative reconstruction.
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Affiliation(s)
- Go Shirota
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
| | - Eriko Maeda
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Yoko Namiki
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Razibul Bari
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Kenji Ino
- Imaging Center, The University of Tokyo Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
| | - Rumiko Torigoe
- Toshiba Medical Systems, 2-1-6, Tsukuda, Chuo-ku, Tokyo, 104-0051 Japan
| | - Osamu Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8655 Japan
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Koh H, Ong CC, Choo YS, Liang CR, Tan GHZ, Lim TCW, Quek SC, Sriram S, Teo LLS. Radiation Dose and Image Quality in Pediatric Cardiac Computed Tomography: A Comparison Between Sequential and Third-Generation Dual-Source High-Pitch Spiral Techniques. Pediatr Cardiol 2016; 37:1397-1403. [PMID: 27377528 DOI: 10.1007/s00246-016-1447-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 06/23/2016] [Indexed: 10/21/2022]
Abstract
The aim of this study was to investigate whether there is a reduction in radiation dose and improvement in image quality of pediatric cardiac computed tomography scans performed using the high-pitch spiral technique on a new third-generation dual-source 2 × 192-slice scanner (group B) compared with scans performed using the sequential technique on a single-source 256-slice scanner (group A). We performed a retrospective observational study on 40 patients aged ≤18 years who underwent prospectively electrocardiogram-triggered cardiac computed tomography. Image quality was assessed by pre-defined objective indices and a four-point subjective score. Apart from a higher mean heart rate in group A (P = 0.016), there were otherwise no significant inter-group differences in patient characteristics. The median effective dose was 4.41 mSv (interquartile range 2.58-5.90 mSv) in group A and 0.52 mSv (interquartile range 0.39-0.59 mSv) in group B (P < 0.001), representing a 88 % reduction. Subjective image quality score was significantly better in group B (4 = excellent with no artifact, mode 57.1 %) than in group A (3 = good with mild artifact, mode 57.9 %) (P < 0.001). Noise index, signal-to-noise ratio and contrast-to-noise ratio between both groups were not statistically significant. New third-generation dual-source high-pitch spiral scan technique can deliver excellent image quality with low radiation dose. Our results suggest that it should be considered as a first-choice technique for performing cardiac computed tomography in the pediatric population.
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Affiliation(s)
- Huiliang Koh
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Ching Ching Ong
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Yun Song Choo
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Chong Ri Liang
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Grace Hui Zhen Tan
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Terence Chee Wen Lim
- Khoo Teck Puat-National University Children's Medical Institute, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Swee Chye Quek
- Khoo Teck Puat-National University Children's Medical Institute, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Shankar Sriram
- Department of Cardiac, Thoracic and Vascular Surgery, National University Heart Centre, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Lynette Li San Teo
- Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore.
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Bu G, Miao Y, Bin J, Deng S, Liu T, Jiang H, Chen W. Comparison of 128-Slice Low-Dose Prospective ECG-Gated CT Scanning and Trans-Thoracic Echocardiography for the Diagnosis of Complex Congenital Heart Disease. PLoS One 2016; 11:e0165617. [PMID: 27788237 PMCID: PMC5082860 DOI: 10.1371/journal.pone.0165617] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 10/15/2016] [Indexed: 11/18/2022] Open
Abstract
Objective To compare prospective ECG-gated multi-slice computed tomography (MSCT) and trans-thoracic echocardiography (TTE) in the diagnosis of complex congenital heart disease (CHD). Methods This was a prospective study of consecutive patients with complex CHD (age <7 years) treated at a tertiary hospital between May 2013 and May 2015. All patients were imaged with TTE and prospective ECG-gated 128-slice spiral CT in the week before surgery. Effective radiation dose (ED) was calculated from volume CT dose index (CTDIvol) and dose length product (DLP). Image quality (5-point scale) was assessed independently by two radiologists. Using surgical findings as the reference, the diagnostic capabilities of MSCT and TTE were compared. Results Thirty-five patients (19 males) aged 1.59±1.58 years (range, 3 days to 74 months) were included. CTDIvol, DLP and ED were 0.90±0.24 mGy, 12.9±4.7 mGy∙cm and 0.64±0.21 mSv (range, 0.358–1.196 mSv), respectively. Image quality score was 4.3±0.5, and all images met the diagnostic requirements. The sensitivity, specificity, positive predictive value, and negative predictive value for diagnosing CHD were 97.2%, 99.8%, 99.0%, and 99.5%, respectively, for MSCT, and 90.6%, 99.8%, 99.0%, and 98.4%, respectively, for TTE. MSCT not only had a higher sensitivity than TTE overall (97.2% vs. 90.6%; P<0.05), but was much more sensitive for the diagnosis of extracardiac vascular abnormalities (92.0% vs. 68.0%; P<0.05). Conclusion 128-slice low-dose prospective ECG-gated CT scanning has important clinical value in the diagnosis of complex CHD in children, complementing and extending the findings of TTE.
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Affiliation(s)
- Guilin Bu
- Radiology Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
- * E-mail:
| | - Ying Miao
- Radiology Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
| | - Jingwen Bin
- Radiology Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
| | - Sheng Deng
- Cardio-Thoracic Surgery, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
| | - Taowen Liu
- Science and Education Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
| | - Hongchun Jiang
- Radiology Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
| | - Weiping Chen
- Radiology Department, Nanxi Hill Hospital of Guangxi Zhuang Autonomous Region, Guilin, China
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Liu Y, Li J, Zhao H, Jia Y, Ren J, Xu J, Hao Y, Zheng M. Image quality and radiation dose of dual-source CT cardiac angiography using prospective ECG-triggering technique in pediatric patients with congenital heart disease. J Cardiothorac Surg 2016; 11:47. [PMID: 27059600 PMCID: PMC4826524 DOI: 10.1186/s13019-016-0460-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 04/05/2016] [Indexed: 11/30/2022] Open
Abstract
Background All studies involving use of ionizing radiation should be performed in accordance with the ALARA (As Low As Reasonably Achievable) principle, especially in children. In this study, the prospective ECG triggering technique with low voltage was used in dual-source computed tomography (DSCT) angiography to investigate if image quality with low radiation dose could be satisfactory in pediatric patients with congenital heart disease. Methods Sixty pediatric patients with suspected congenital cardiovascular anomalies were enrolled prospectively in the study. They were randomly assigned to two groups for DSCT angiography. Group A were scanned by prospective ECG-triggering computed tomography angiography (CTA) with 80 kV tube voltage, while group B by used non-ECG-gated CTA with the same tube voltage. The anomaly accuracy was evaluated based on the surgical and/or conventional cardiac angiography findings. The overall image quality was assessed on a five-point scale. And the diagnostic accuracy and radiation dose was evaluated in both groups. Results There were 127 cardiovascular anomalies in Group A and 108 in Group B. The mean subjective image quality and diagnostic accuracy between these two groups were significantly different (P = 0.007 and 0.011, respectively). The mean effective dose in Group A and Group B was 0.38 ± 0.13 mSv and 0.35 ± 0.17 mSv, respectively. But there was no significant difference between two groups (P = 0.197). Conclusions The prospective ECG triggering technique in DSCT scan can offer better image quality and diagnostic accuracy with low radiation exposure in pediatric patients with congenital heart diseases. This technique has potential to become a new clinical routine in pediatric cardiac computed tomography (CT) imaging.
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Affiliation(s)
- Ying Liu
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Jian Li
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Hongliang Zhao
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Yan Jia
- Siemens China Ltd., Shang Hai, China
| | - Jing Ren
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Jian Xu
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Yuewen Hao
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China
| | - Minwen Zheng
- Department of Radiology, Xijing Hospital, Fourth Military Medical University, 169 West Changle Road, Xi'an, 710032, China.
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Third-generation dual-source 70-kVp chest CT angiography with advanced iterative reconstruction in young children: image quality and radiation dose reduction. Pediatr Radiol 2016; 46:462-72. [PMID: 26739141 DOI: 10.1007/s00247-015-3510-x] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 09/27/2015] [Accepted: 11/12/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND Many technical updates have been made in multi-detector CT. OBJECTIVE To evaluate image quality and radiation dose of high-pitch second- and third-generation dual-source chest CT angiography and to assess the effects of different levels of advanced modeled iterative reconstruction (ADMIRE) in newborns and children. MATERIALS AND METHODS Chest CT angiography (70 kVp) was performed in 42 children (age 158 ± 267 days, range 1-1,194 days). We evaluated subjective and objective image quality, and radiation dose with filtered back projection (FBP) and different strength levels of ADMIRE. For comparison were 42 matched controls examined with a second-generation 128-slice dual-source CT-scanner (80 kVp). RESULTS ADMIRE demonstrated improved objective and subjective image quality (P < .01). Mean signal/noise, contrast/noise and subjective image quality were 11.9, 10.0 and 1.9, respectively, for the 80 kVp mode and 11.2, 10.0 and 1.9 for the 70 kVp mode. With ADMIRE, the corresponding values for the 70 kVp mode were 13.7, 12.1 and 1.4 at strength level 2 and 17.6, 15.6 and 1.2 at strength level 4. Mean CTDIvol, DLP and effective dose were significantly lower with the 70-kVp mode (0.31 mGy, 5.33 mGy*cm, 0.36 mSv) compared to the 80-kVp mode (0.46 mGy, 9.17 mGy*cm, 0.62 mSv; P < .01). CONCLUSION The third-generation dual-source CT at 70 kVp provided good objective and subjective image quality at lower radiation exposure. ADMIRE improved objective and subjective image quality.
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Dual-source computed tomography for evaluating pulmonary artery in pediatric patients with cyanotic congenital heart disease: Comparison with transthoracic echocardiography. Eur J Radiol 2015; 85:187-192. [PMID: 26724664 DOI: 10.1016/j.ejrad.2015.11.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Revised: 10/08/2015] [Accepted: 11/02/2015] [Indexed: 02/05/2023]
Abstract
PURPOSE To evaluate the quantitative accuracy of dual-source computed tomography (DSCT) on measurements of pulmonary artery in pediatric patients with cyanotic congenital heart diseases (CCHDs) when compared with transthoracic echocardiography (TTE). METHODS Thirty-five patients (mean age: 27.88 ± 28.27 months) with CCHDs underwent DSCT and TTE for evaluating the diameter of the main pulmonary artery (MPA), right pulmonary artery (RPA), and left pulmonary artery (LPA). Surgical measurements were obtained and served as the reference standard. The agreement was tested by linear regression analysis, Pearson's correlation coefficient, and Bland-Altman analysis. The intra- and extracardiac malformations were also observed. RESULTS There was a markedly positive correlation between DSCT and surgical measurements of the MPA, RPA, and LPA (r=0.95-0.97; all p<0.001), although the overestimation of the measurements of MPA, RPA, and LPA (bias 0.15 ± 0.95, 0.31 ± 0.63 and 0.35 ± 0.68 mm, respectively) was observed. However, there was a moderate correlation between TTE and surgical measurements of MPA, RPA, and LPA (r=0.61-0.84; all p<0.001), and the underestimation of the measurements of MPA, RPA, and LPA (bias-1.20 ± 1.69, -1.80 ± 1.77, and -1.50 ± 2.30 mm, respectively) was observed. In addition, DSCT was more efficient in finding associated malformations than TTE (40/40 vs. 33/40). CONCLUSIONS As a reliable, noninvasive and radiation-save imaging modality, DSCT can provide more accurate pulmonary artery measurements than TTE in cardiac surgical procedures.
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Shi K, Yang ZG, Chen J, Zhang G, Xu HY, Guo YK. Assessment of Double Outlet Right Ventricle Associated with Multiple Malformations in Pediatric Patients Using Retrospective ECG-Gated Dual-Source Computed Tomography. PLoS One 2015; 10:e0130987. [PMID: 26115034 PMCID: PMC4482600 DOI: 10.1371/journal.pone.0130987] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 05/26/2015] [Indexed: 02/05/2023] Open
Abstract
Purpose To evaluate the feasibility and diagnostic accuracy of retrospective electrocardiographically (ECG)-gated dual-source computed tomography (DSCT) for the assessment of double outlet right ventricle (DORV) and associated multiple malformations in pediatric patients. Materials and Methods Forty-seven patients <10 years of age with DORV underwent retrospective ECG-gated DSCT. The location of the ventricular septal defect (VSD), alignment of the two great arteries, and associated malformations were assessed. The feasibility of retrospective ECG-gated DSCT in pediatric patients was assessed, the image quality of DSCT and the agreement of the diagnosis of associated malformations between DSCT and transthoracic echocardiography (TTE) were evaluated, the diagnostic accuracies of DSCT and TTE were referred to surgical results, and the effective doses were calculated. Results Apart from DORV, 109 associated malformations were confirmed postoperatively. There was excellent agreement (κ = 0.90) for the diagnosis of associated malformations between DSCT and TTE. However, DSCT was superior to TTE in demonstrating paracardiac anomalies (sensitivity, coronary artery anomalies: 100% vs. 80.00%, anomalies of great vessels: 100% vs. 88.57%, separate thoracic and abdominal anomalies: 100% vs. 76.92%, respectively). Combined with TTE, DSCT can achieve excellent diagnostic performance in intracardiac anomalies (sensitivity, 91.30% vs. 100%). The mean image quality score was 3.70 ± 0.46 (κ = 0.76). The estimated mean effective dose was < 1 mSv (0.88 ± 0.34 mSv). Conclusions Retrospective ECG-gated DSCT is a better diagnostic tool than TTE for pediatric patients with complex congenital heart disease such as DORV. Combined with TTE, it may reduce or even obviate the use of invasive cardiac catheterization, and thus expose the patients to a much lower radiation dose.
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Affiliation(s)
- Ke Shi
- Department of Radiology, West China Hospital, Sichuan University, 37# Guo Xue Xiang, Chengdu, Sichuan 610041, China
| | - Zhi-gang Yang
- Department of Radiology, West China Hospital, Sichuan University, 37# Guo Xue Xiang, Chengdu, Sichuan 610041, China
- National Key Laboratory of Biotherapy, West China Hospital, Sichuan University, 17# Section 3 South Renmin Road, Chengdu, Sichuan 610041, China
- * E-mail: (ZGY); (YKG)
| | - Jing Chen
- Department of Radiology, West China Hospital, Sichuan University, 37# Guo Xue Xiang, Chengdu, Sichuan 610041, China
| | - Ge Zhang
- Department of Radiology, West China Hospital, Sichuan University, 37# Guo Xue Xiang, Chengdu, Sichuan 610041, China
| | - Hua-yan Xu
- Department of Radiology, West China Hospital, Sichuan University, 37# Guo Xue Xiang, Chengdu, Sichuan 610041, China
- National Key Laboratory of Biotherapy, West China Hospital, Sichuan University, 17# Section 3 South Renmin Road, Chengdu, Sichuan 610041, China
| | - Ying-kun Guo
- Department of Radiology, West China Second University Hospital, Sichuan University, 20# Section 3 South Renmin Road, Chengdu, Sichuan 610041, China
- * E-mail: (ZGY); (YKG)
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Nelson TR. Practical Strategies to Reduce Pediatric CT Radiation Dose. J Am Coll Radiol 2014; 11:292-9. [DOI: 10.1016/j.jacr.2013.10.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Accepted: 10/09/2013] [Indexed: 10/25/2022]
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Drees R, François CJ, Saunders JH. INVITED REVIEW-COMPUTED TOMOGRAPHIC ANGIOGRAPHY (CTA) OF THE THORACIC CARDIOVASCULAR SYSTEM IN COMPANION ANIMALS. Vet Radiol Ultrasound 2014; 55:229-40. [DOI: 10.1111/vru.12149] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2013] [Accepted: 12/06/2013] [Indexed: 12/18/2022] Open
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Airway Compression in Children With Congenital Heart Disease Evaluated Using Computed Tomography. Ann Thorac Surg 2013; 96:2192-7. [DOI: 10.1016/j.athoracsur.2013.07.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 06/26/2013] [Accepted: 07/01/2013] [Indexed: 11/18/2022]
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Zacharias C, Alessio AM, Otto RK, Iyer RS, Philips GS, Swanson JO, Thapa MM. Pediatric CT: strategies to lower radiation dose. AJR Am J Roentgenol 2013; 200:950-6. [PMID: 23617474 PMCID: PMC4748846 DOI: 10.2214/ajr.12.9026] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
OBJECTIVE The introduction of MDCT has increased the utilization of CT in pediatric radiology along with concerns for radiation sequelae. This article reviews general principles of lowering radiation dose, the basic physics that impact radiation dose, and specific CT integrated dose-reduction tools focused on the pediatric population. CONCLUSION The goal of this article is to provide a comprehensive review of the recent literature regarding CT dose reduction methods, their limitations, and an outlook on future developments with a focus on the pediatric population. The discussion will initially focus on general considerations that lead to radiation dose reduction, followed by specific technical features that influence the radiation dose.
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Duan Y, Wang X, Cheng Z, Wu D, Wu L. Application of prospective ECG-triggered dual-source CT coronary angiography for infants and children with coronary artery aneurysms due to Kawasaki disease. Br J Radiol 2012; 85:e1190-7. [PMID: 22932064 DOI: 10.1259/bjr/18174517] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVES The aim of this study was to prospectively evaluate the initial application and value of prospective electrocardiogram (ECG)-triggered dual-source CT coronary angiography (DSCTCA) in the diagnosis of infants and children with coronary artery aneurysms due to Kawasaki disease. METHODS 19 children [12 males; mean age 13.47 months, range 3 months to 5 years; mean heart rate 112 beats per minute (bpm), range 83-141 bpm] underwent prospective ECG-triggered DSCTCA with free breathing. Subjective image quality was assessed on a five-point scale (1, excellent; 5, non-diagnostic) by two blinded observers. The location, number and size of each aneurysm were observed and compared with those of transthoracic echocardiography (TTE) performed within 1 week. Interobserver agreement concerning the subjective image quality was evaluated with Cohen's κ-test. Bland-Altman analysis was used to evaluate the agreement on measurements (diameter and length of aneurysms) between DSCTCA and TTE. The average effective dose required for DSCTCA was calculated for all children. RESULTS All interobserver agreement for subjective image quality assessment was excellent (κ=0.87). The mean ± standard deviation (SD) aneurysm diameter with DSCTCA was 0.76 ± 0.36 cm and with TTE was 0.76 ± 0.39 cm. The mean ± SD aneurysm length with DSCTCA was 2.06 ± 1.35 cm and with TTE was 2.00 ± 1.22 cm. The Bland-Altman plot for agreement between DSCTCA and TTE measurements showed good agreement. The mean effective dose was 0.36 ± 0.06 mSv. CONCLUSION As an alternative diagnostic modality, prospective ECG-triggered DSCTCA with excellent image quality and low radiation exposure has been proved useful for diagnosing infants and children with coronary artery aneurysms due to Kawasaki disease. ADVANCES IN KNOWLEDGE Prospective ECG-triggered DSCTCA for infants and children allows rapid, accurate assessment of coronary aneurysms due to Kawasaki diseases, compared with TTE.
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Affiliation(s)
- Y Duan
- Medical School of Shandong University, Shandong Medical Imaging Research Institute, Jinan, China
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The value of low-dose prospective ECG-gated dual-source CT angiography in the diagnosis of coarctation of the aorta in infants and children. Clin Radiol 2012; 67:738-45. [DOI: 10.1016/j.crad.2011.12.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 12/10/2011] [Accepted: 12/19/2011] [Indexed: 11/20/2022]
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Gao Y, Lu B, Hou Z, Yu F, Cao H, Han L, Wu R. Low dose dual-source CT angiography in infants with complex congenital heart disease: A randomized study. Eur J Radiol 2012; 81:e789-95. [DOI: 10.1016/j.ejrad.2012.03.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 03/18/2012] [Accepted: 03/19/2012] [Indexed: 10/28/2022]
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Accuracy, image quality and radiation dose comparison of high-pitch spiral and sequential acquisition on 128-slice dual-source CT angiography in children with congenital heart disease. Eur Radiol 2012; 22:2057-66. [DOI: 10.1007/s00330-012-2479-1] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2012] [Revised: 03/19/2012] [Accepted: 03/27/2012] [Indexed: 10/28/2022]
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Point/counterpoint: dose-related issues in cardiac CT imaging. Pediatr Radiol 2011; 41 Suppl 2:528-33. [PMID: 21847735 DOI: 10.1007/s00247-011-2153-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 04/14/2011] [Accepted: 05/03/2011] [Indexed: 10/17/2022]
Abstract
This manuscript reviews some of the more controversial dose-related issues in cardiac CT imaging. Discussion covers the relative merits of cardiac CT versus MR, advantages and concerns regarding gated versus nongated cardiac CT and advantages and concerns regarding the use of breast shields in girls undergoing cardiac CT imaging.
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Huang MP, Liang CH, Zhao ZJ, Liu H, Li JL, Zhang JE, Cui YH, Yang L, Liu QS, Ivanc TB, Vembar M. Evaluation of image quality and radiation dose at prospective ECG-triggered axial 256-slice multi-detector CT in infants with congenital heart disease. Pediatr Radiol 2011; 41:858-66. [PMID: 21534003 DOI: 10.1007/s00247-011-2079-2] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 12/11/2010] [Accepted: 12/11/2010] [Indexed: 10/18/2022]
Abstract
BACKGROUND There are a limited number of reports on the technical and clinical feasibility of prospective electrocardiogram (ECG)-gated multi-detector computed tomography (MDCT) in infants with congenital heart disease (CHD). OBJECTIVE To evaluate image quality and radiation dose at weight-based low-dose prospectively gated 256-slice MDCT angiography in infants with CHD. MATERIALS AND METHODS From November 2009 to February 2010, 64 consecutive infants with CHD referred for pre-operative or post-operative CT were included. All were scanned on a 256-slice MDCT system utilizing a low-dose protocol (80 kVp and 60-120 mAs depending on weight: 60 mAs for ≤ 3 kg, 80 mAs for 3.1-6 kg, 100 mAs for 6.1-10 kg, 120 mAs for 10.1-15 kg). RESULTS No serious adverse events were recorded. A total of 174 cardiac deformities, confirmed by surgery or heart catheterization, were studied. The sensitivity of MDCT for cardiac deformities was 97.1%; specificity, 99.4%; accuracy, 95.9%. The mean heart rate during scan was 136.7 ± 14.9/min (range, 91-160) with a corresponding heart rate variability of 2.8 ± 2.2/min (range, 0-8). Mean scan length was 115.3 ± 11.7 mm (range, 93.6-143.3). Mean volume CT dose index, mean dose-length product and effective dose were 2.1 ± 0.4 mGy (range, 1.5-2.8), 24.7 ± 5.9 mGy·cm (range, 14.7-35.8) and 1.6 ± 0.3 mSv (range, 1.1-2.5), respectively. Diagnostic-quality images were achieved in all cases. Satisfactory diagnostic quality for visualization of all/proximal/distal coronary artery segments was achieved in 88.4/98.8/80.0% of the scans. CONCLUSION Low-dose prospectively gated axial 256-slice CT angiography is a valuable tool in the routine clinical evaluation of infants with CHD, providing a comprehensive three-dimensional evaluation of the cardiac anatomy, including the coronary arteries.
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Affiliation(s)
- Mei-ping Huang
- Department of Radiology, Guangdong Academy of Medical Sciences, Guangdong General Hospital, 106 Zhongshan Er Road, Guangzhou, People's Republic of China
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van der Bijl N, Geleijns J, Joemai RMS, Bax JJ, Schuijf JD, de Roos A, Kroft LJM. Recent developments in cardiac CT. ACTA ACUST UNITED AC 2011. [DOI: 10.2217/iim.11.7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Current world literature. Curr Opin Cardiol 2011; 26:165-73. [PMID: 21307667 DOI: 10.1097/hco.0b013e328344b569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Young C, Taylor AM, Owens CM. Paediatric cardiac computed tomography: a review of imaging techniques and radiation dose consideration. Eur Radiol 2010; 21:518-29. [PMID: 21188593 DOI: 10.1007/s00330-010-2036-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2010] [Revised: 12/06/2010] [Accepted: 12/08/2010] [Indexed: 01/10/2023]
Abstract
The significant challenges involved in imaging the heart in small children (<15 kg) have been addressed by, and partially resolved with improvement in temporal and spatial resolution secondary to the advent of new multi-detector CT technology. This has enabled both retrospective and prospective ECG-gated imaging in children even at high heart rates (over 100 bpm) without the need for beta blockers. Recent studies have highlighted that the radiation burden associated with cardiac CT can be reduced using prospective ECG-gating. Our experience shows that the resultant dose reduction can be optimised to a level equivalent to that of a non-gated study. This article reviews the different aspects of ECG-gating and the preferred technique for cardiac imaging in the young child (<15 kg). We summarize our evidenced based recommendations for readers, referencing recent articles and using our in house data, protocols and dose measurements discussing the various methods available for dose calculations and their inherent bias.
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Affiliation(s)
- Carolyn Young
- Cardiorespiratory Unit, UCL Institute of Child Health, London, UK.
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Rigsby CK, deFreitas RA, Nicholas AC, Leidecker C, Johanek AJ, Anley P, Wang D, Uejima T. Safety and efficacy of a drug regimen to control heart rate during 64-slice ECG-gated coronary CTA in children. Pediatr Radiol 2010; 40:1880-9. [PMID: 20499055 DOI: 10.1007/s00247-010-1711-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 04/06/2010] [Accepted: 05/05/2010] [Indexed: 11/25/2022]
Abstract
BACKGROUND The adult practice for ECG-gated single-source 64-slice coronary CTA (CCTA) includes administering beta-blockers to reduce heart rate. There are limited data on this process in children. OBJECTIVE To evaluate the safety and efficacy of a drug regimen to decrease heart rate before performing CCTA in children. MATERIALS & METHODS IV remifentanil and esmolol infusion were chosen to decrease heart rate in 41 children (mean age 6.5 years) while they were under general anesthesia (GA) for CCTA. Drug doses, changes in heart rate and procedural complications were recorded. CCTA image quality was graded on a scale of 1 to 5. The relationships between image quality and heart rate and image quality and age were evaluated. Patient effective radiation doses were calculated. RESULTS Heart rates were lowered utilizing esmolol (4 children), remifentanil (2 children) or both (35 children); 26 children received nitroglycerin for coronary vasodilation. The mean decrease in heart rate was 26%. There were no major complications. The average image-quality score was 4.4. Higher heart rates were associated with worse image quality (r = 0.67, P < 0.0001). Older age was associated with better image quality (r = 0.66, P < 0.0001). Effective radiation doses were 0.7 to 7.0 mSv. CONCLUSION Heart rate reduction for pediatric CCTA can be safely and effectively achieved while yielding high-quality images.
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Affiliation(s)
- Cynthia K Rigsby
- Department of Medical Imaging, Children's Memorial Hospital, 2300 Children's Plaza, Chicago, IL 60614, USA.
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