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Hoshino T, Ichikawa K, Hara T, Terakawa S, Hosomi K, Nishimura K, Takayama K. Optimization of scan timing for aortic computed tomographic angiography using the test bolus injection technique. Acta Radiol 2016; 57:829-36. [PMID: 26468389 DOI: 10.1177/0284185115608659] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 08/24/2015] [Indexed: 11/17/2022]
Abstract
BACKGROUND With fast computed tomography (CT), it is possible for the scanning to outpace the contrast medium bolus during aortic CT angiography (CTA). PURPOSE To evaluate the effectiveness of a new method for reducing the risk of outpacing in which the scan start timing (ST) and speed can be estimated from the peak enhancement time measured at the femoral artery using a single test-bolus injection (femoral artery test injection method [FTI method]). MATERIAL AND METHODS In 30 cases of aortic CTA, we measured the time to peak enhancement at the femoral artery (TPF) and the ascending aorta (TPA) with test-bolus injection performed twice in each examination. From the resultant linear relationship between TPF and transit time (TT = TPF - TPA), we developed a method for determining the ST and TT from TPF. One hundred patients were assigned to two groups: FTI and bolus tracking (BT), each with 50 patients. CT values were measured in main vessels (ascending aorta, descending aorta, femoral artery). The CT values of the vessels and the rate of cases with more than 300 HU (good cases) were compared between the two groups. RESULTS The enhancement in the FTI method was significantly higher than that of the BT method (average CT values: FTI, 388.3 ± 52.4; BT, 281.2 ± 59.1; P < 0.001). The rates of good cases for FTI and BT were 86.0% and 46.0%, respectively. CONCLUSION The FTI method was very effective in reducing the risk of outpacing of the contrast medium transit in aortic CTA without the need for an additional contrast medium dose.
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Affiliation(s)
- Takashi Hoshino
- Department of Radiology, Ishinkai Yao General Hospital, Osaka, Japan
- Graduate School of Medical Science, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Katsuhiro Ichikawa
- Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan
| | - Takanori Hara
- Department of Medical Technology, Nakatsugawa Municipal General Hospital, Nakatsugawa, Gifu, Japan
| | - Shoichi Terakawa
- Department of Radiology, Osaka City General Hospital, Osaka, Japan
| | - Kazuhiro Hosomi
- Department of Radiology, Ishinkai Yao General Hospital, Osaka, Japan
| | - Kenji Nishimura
- Department of Radiology, Ishinkai Yao General Hospital, Osaka, Japan
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Chou R, Cuevas C, Fu R, Devine B, Wasson N, Ginsburg A, Zakher B, Pappas M, Graham E, Sullivan SD. Imaging Techniques for the Diagnosis of Hepatocellular Carcinoma: A Systematic Review and Meta-analysis. Ann Intern Med 2015; 162:697-711. [PMID: 25984845 DOI: 10.7326/m14-2509] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Several imaging modalities are available for diagnosis of hepatocellular carcinoma (HCC). PURPOSE To evaluate the test performance of imaging modalities for HCC. DATA SOURCES MEDLINE (1998 to December 2014), the Cochrane Library Database, Scopus, and reference lists. STUDY SELECTION Studies on test performance of ultrasonography, computed tomography (CT), or magnetic resonance imaging (MRI). DATA EXTRACTION One investigator abstracted data, and a second investigator confirmed them; 2 investigators independently assessed study quality and strength of evidence. DATA SYNTHESIS Few studies have evaluated imaging for HCC in surveillance settings. In nonsurveillance settings, sensitivity for detection of HCC lesions was lower for ultrasonography without contrast than for CT or MRI (pooled difference based on direct comparisons, 0.11 to 0.22), and MRI was associated with higher sensitivity than CT (pooled difference, 0.09 [95% CI, 0.07 to 12]). For evaluation of focal liver lesions, there were no clear differences in sensitivity among ultrasonography with contrast, CT, and MRI. Specificity was generally 0.85 or higher across imaging modalities, but this item was not reported in many studies. Factors associated with lower sensitivity included use of an explanted liver reference standard, and smaller or more well-differentiated HCC lesions. For MRI, sensitivity was slightly higher for hepatic-specific than nonspecific contrast agents. LIMITATIONS Only English-language articles were included, there was statistical heterogeneity in pooled analyses, and costs were not assessed. Most studies were conducted in Asia and had methodological limitations. CONCLUSION CT and MRI are associated with higher sensitivity than ultrasonography without contrast for detection of HCC; sensitivity was higher for MRI than CT. For evaluation of focal liver lesions, the sensitivities of ultrasonography with contrast, CT, and MRI for HCC are similar. PRIMARY FUNDING SOURCE Agency for Healthcare Research and Quality. ( PROSPERO CRD42014007016).
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Affiliation(s)
- Roger Chou
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Carlos Cuevas
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Rongwei Fu
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Beth Devine
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Ngoc Wasson
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Alexander Ginsburg
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Bernadette Zakher
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Miranda Pappas
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Elaine Graham
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
| | - Sean D. Sullivan
- From Pacific Northwest Evidence-based Practice Center, Oregon Health & Science University, Portland, Oregon; University of Washington Centers for Comparative and Health Systems Effectiveness (CHASE) Alliance, Seattle, Washington; and Mayo Medical School, Rochester, Minnesota
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Adibi A, Shahbazi A. Automatic bolus tracking versus fixed time-delay technique in biphasic multidetector computed tomography of the abdomen. IRANIAN JOURNAL OF RADIOLOGY : A QUARTERLY JOURNAL PUBLISHED BY THE IRANIAN RADIOLOGICAL SOCIETY 2014; 11:e4617. [PMID: 24693300 PMCID: PMC3955856 DOI: 10.5812/iranjradiol.4617] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 08/14/2012] [Accepted: 10/13/2012] [Indexed: 11/16/2022]
Abstract
Background Bolus tracking can individualize time delay for the start of scans in spiral computed tomography (CT). Objectives We compared automatic bolus tracking method with fixed time-delay technique in biphasic contrast enhancement during multidetector CT of abdomen. Patients and Methods Adult patients referred for spiral CT of the abdomen were randomized into two groups; in group 1, the arterial and portal phases of spiral scans were started 25 s and 55 s after the start of contrast material administration; in group 2, using the automatic bolus tracking software, repetitive monitoring scans were performed within the lumen of the descending aorta as the region of interest with the threshold of starting the diagnostic scans as 60 HU. The contrast enhancement of the aorta, liver, and spleen were compared between the groups. Results Forty-eight patients (23 males, 25 females, mean age=56.4±13.5 years) were included. The contrast enhancement of the aorta, liver, and spleen at the arterial phase was similar between the two groups (P>0.05). Regarding the portal phase, the aorta and spleen were more enhanced in the bolus-tracking group (P<0.001). The bolus tracking provided more homogeneous contrast enhancement among different patients than the fixed time-delay technique in the liver at portal phase, but not at the arterial phase. Conclusions The automatic bolus-tracking method, results in higher contrast enhancement of the aorta and spleen at the portal phase, but has no effect on liver enhancement. However, bolus tracking is associated with reduced variability for liver enhancement among different patients.
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Affiliation(s)
- Atoosa Adibi
- Department of Radiology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Ali Shahbazi
- Department of Radiology, Isfahan University of Medical Sciences, Isfahan, Iran
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Nakahara T, Jinzaki M, Fukuda N, Takahashi Y, Ishihara T, Takada A, Suzuki K, Manita M, Imanari T, Kanesawa N, Kuribayashi S, Kurabayashi M. Estimation of the left ventricular diastolic function with cardiac MDCT: correlation of the slope of the time-enhancement-curve with the mitral annulus diastolic velocity. Eur J Radiol 2011; 81:234-8. [PMID: 21239129 DOI: 10.1016/j.ejrad.2010.12.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 12/17/2010] [Indexed: 11/26/2022]
Abstract
Patients with diastolic heart failure tend to have a poor outcome, similar to that for patients with systolic heart failure. The aim of this study was to explore the ability of MDCT to estimate the left ventricular diastolic function. Thirty patients with suspected coronary artery disease underwent MDCT and echocardiography. The early transmitral flow velocities (E) and the velocity of mitral annulus early diastolic motion (e') were measured in order to evaluate the diastolic function. The scanning delay of CT was determined using a test injection technique. The aortic enhancement was measured over the aortic-root lumen, and it was plotted over time to yield a time-enhancement-curve. A gamma variate function was then fit to the time-enhancement-curve and thereafter both the 'slope' of enhancement for each patient and the region of interest [ROI] were calculated. According to a univariate analysis, the slope of the time-enhancement-curve was found to correlate with the e' (r = 0.686, P = 0.000) and E/e' (r = -0.482, P = 0.007), however, no significant correlation was observed with the systolic parameters of the left ventricle. These results indicate that the slope of the time-enhancement-curve in the aorta significantly correlates with e', i.e. the diastolic parameters, which are independent of the systolic parameters. Based on these findings, we propose that the slope of the time-enhancement-curve may serve as a parameter for the left ventricular diastolic function on MDCT.
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Affiliation(s)
- Takehiro Nakahara
- Department of Medicine and Biological Science, Gunma University Graduate School of Medicine, 3-39-22 Showa, Maebashi, Gunma 371-8511, Japan.
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Thomas MB, Jaffe D, Choti MM, Belghiti J, Curley S, Fong Y, Gores G, Kerlan R, Merle P, O'Neil B, Poon R, Schwartz L, Tepper J, Yao F, Haller D, Mooney M, Venook A. Hepatocellular carcinoma: consensus recommendations of the National Cancer Institute Clinical Trials Planning Meeting. J Clin Oncol 2010; 28:3994-4005. [PMID: 20679622 DOI: 10.1200/jco.2010.28.7805] [Citation(s) in RCA: 306] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Hepatocelluar carcinoma (HCC) is the most common primary malignancy of the liver in adults and the third most common cause of cancer death worldwide. The incidence of HCC in the United States is rising steadily because of the prevalence of hepatitis C viral infection and other causes of hepatic cirrhosis. The majority of patients have underlying hepatic dysfunction, which complicates patient management and the search for safe and effective therapies. The Clinical Trials Planning Meeting (CTPM) in HCC was convened by the National Cancer Institute's Gastrointestinal Cancer Steering Committee to identify the key knowledge gaps in HCC and define clinical research priorities. The CTPM structured its review according to current evidence-based treatment modalities in HCC and prioritized the recommendations on the basis of the patient populations representing the greatest unmet medical need.
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Affiliation(s)
- Melanie B Thomas
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA.
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