Abstract:
OBJECTIVE:This study determined the effect of dose reduction and kernel selection on quantifying emphysema using low-dose computed tomography (LDCT) and evaluated the efficiency of a deep learning-based kernel conversion technique in normalizing kernels for emphysema quantification. METHODS:A sample of 131 participants underwent LDCT and standard-dose computed tomography (SDCT) at 1- to 2-year intervals. LDCT images were reconstructed with B31f and B50f kernels, and SDCT images were reconstructed with B30f kernels. A deep learning model was used to convert the LDCT image from a B50f kernel to a B31f kernel. Emphysema indices (EIs), lung attenuation at 15th percentile (perc15), and mean lung density (MLD) were calculated. Comparisons among the different kernel types for both LDCT and SDCT were performed using Friedman's test and Bland-Altman plots. RESULTS:All values of LDCT B50f were significantly different compared with the values of LDCT B31f and SDCT B30f (p < 0.05). Although there was a statistical difference, the variation of the values of LDCT B50f significantly decreased after kernel normalization. The 95% limits of agreement between the SDCT and LDCT kernels (B31f and converted B50f) ranged from - 2.9 to 4.3% and from - 3.2 to 4.4%, respectively. However, there were no significant differences in EIs and perc15 between SDCT and LDCT converted B50f in the non-chronic obstructive pulmonary disease (COPD) participants (p > 0.05). CONCLUSION:The deep learning-based CT kernel conversion of sharp kernel in LDCT significantly reduced variation in emphysema quantification, and could be used for emphysema quantification. KEY POINTS:• Low-dose computed tomography with smooth kernel showed adequate performance in quantifying emphysema compared with standard-dose CT. • Emphysema quantification is affected by kernel selection and the application of a sharp kernel resulted in a significant overestimation of emphysema. • Deep learning-based kernel normalization of sharp kernel significantly reduced variation in emphysema quantification.
journal_name
Eur Radioljournal_title
European radiologyauthors
Bak SH,Kim JH,Jin H,Kwon SO,Kim B,Cha YK,Kim WJdoi
10.1007/s00330-020-07020-3subject
Has Abstractpub_date
2020-12-01 00:00:00pages
6779-6787issue
12eissn
0938-7994issn
1432-1084pii
10.1007/s00330-020-07020-3journal_volume
30pub_type
杂志文章abstract:OBJECTIVES:Time-resolved contrast-enhanced MR angiography (4D-MRA), which allows the simultaneous visualization of the vasculature and blood-flow dynamics, is widely used in clinical routine. In this study, the impact of two different contrast agent injection methods on 4D-MRA was examined in a controlled, standardized...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-5178-0
更新日期:2018-05-01 00:00:00
abstract::A retrospective evaluation of the imaging of 13 patients with a diagnosis of osteoid osteoma (OO) of the spine was undertaken. Available imaging included radiographs (n=10), computed tomography (CT) (n=13), bone scintigraphy (n=5) and magnetic resonance imaging (MRI) (n=13). MRI features evaluated were pattern of neur...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-005-2816-8
更新日期:2005-12-01 00:00:00
abstract::Diverticular disease is a common condition in Western countries. The formation of inflammatory fistulae, usually from sigmoid colon to bladder or vagina, can be a feature of complicated cases of the disorder and is normally an indication for surgical intervention. We present a case of colosalpingeal fistulation occurr...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300050864
更新日期:1999-01-01 00:00:00
abstract:OBJECTIVE:To compare cardiac left ventricular (LV) parameters in simultaneously acquired hybrid fluorine-18-fluorodeoxyglucose ([18F] FDG) positron emission tomography/magnetic resonance imaging (PET/MRI) in patients with residual tracer activity of upstream PET/CT. METHODS:Twenty-nine patients (23 men, age 58±17 year...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-4896-7
更新日期:2017-12-01 00:00:00
abstract::Aim of this study was to develop a time-efficient sequence protocol for a 1.0 T dedicated MR system to be used for whole-organ scoring of osteoarthritis (OA). Thirty-four knees were examined using a protocol that included fat suppressed fast spin echo proton density weighted sequences (PDFS) in three planes plus a cor...
journal_title:European radiology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00330-004-2608-6
更新日期:2005-05-01 00:00:00
abstract:OBJECTIVE:To evaluate the delayed effects of irreversible electroporation (IRE) ablation on nerves. METHODS:The study was approved by the institutional animal care and use committee. CT-guided IRE-ablation (electric field per distance, 1,500 V/cm; pulse length, 70 μs; number of pulses, 90) of 6 sciatic nerves was perf...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-012-2610-3
更新日期:2013-02-01 00:00:00
abstract:OBJECTIVE:It is controversial to adopt non-invasive diagnostic criteria of hepatocellular carcinoma (HCC) in subcentimeter lesions. This study was aimed to define the optimal noninvasive diagnostic criteria of subcentimeter HCC and to evaluate the effect on tumor staging. METHODS:We included 110 treatment-naïve patien...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-020-07329-z
更新日期:2020-10-12 00:00:00
abstract:OBJECTIVES:We hypothesized that non-contrast-enhanced PETRA (pointwise encoding time reduction with radial acquisition) MR (magnetic resonance) sequencing could be an alternative to unenhanced computed tomography (CT) in assessing cystic fibrosis (CF) lung structural alterations, as well as compared agreements and conc...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-016-4218-5
更新日期:2016-11-01 00:00:00
abstract:OBJECTIVES:To evaluate the positive predictive values (PPVs) of calcifications with suspicious morphology by incorporating distribution and clinical factors in two separate cohorts to provide more practical guidance for management. METHODS:This retrospective study included 1076 consecutive women from two cohorts (coho...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-020-07215-8
更新日期:2020-09-22 00:00:00
abstract::Our purpose was to assess the effect of computer-aided detection (CAD) on lesion detection as a second reader in computed tomographic colonography, and to compare the influence of CAD on the performance of readers with different levels of expertise. Fifty-two CT colonography patient data-sets (37 patients: 55 endoscop...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-007-0608-z
更新日期:2007-10-01 00:00:00
abstract:OBJECTIVES:To evaluate whether iterative reconstruction algorithms improve the diagnostic accuracy of coronary CT angiography (CCTA) for detection of lipid-core plaque (LCP) compared to histology. METHODS AND MATERIALS:CCTA and histological data were acquired from three ex vivo hearts. CCTA images were reconstructed u...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-014-3404-6
更新日期:2015-01-01 00:00:00
abstract::Defining the origin of low back pain is a challenging task. Among a variety of factors the sacroiliac joint (SIJ) is a possible pain generator, although precise diagnosis is difficult. Joint blocks may reduce pain, but are, in cases, of only temporary effect. This study was conducted to evaluate CT-guided percutaneous...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-001-1257-2
更新日期:2002-06-01 00:00:00
abstract::An aberrant channel was identified on CT in the petrous bone in four patients presenting with unrelated otological symptoms. These channels occurred unilaterally in each case. In two patients, the channel was seen to run between the sigmoid sinus sulcus and the superior petrosal sinus sulcus; in one of these patients,...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-009-1492-5
更新日期:2009-12-01 00:00:00
abstract::Noonan's syndrome is a rare congenital disorder that may be associated with abnormalities in the lymphatic drainage. In this case of a 21-year-old man CT after bipedal lymphangiography confirmed the diagnosis of intestinal lymphangiectasy causing protein-losing enteropathy in Noonan's syndrome by showing contrast-enha...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300000384
更新日期:2000-01-01 00:00:00
abstract::The aim of our study was to evaluate the use of a 1-molar gadolinium chelate (gadobutrol) as an alternative contrast medium for computed tomography angiography (CTA) exams of the aorta. CTA exams of the thoracic and/or abdominal aorta were performed on 15 patients with contraindications for the use of iodine who were ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-007-0590-5
更新日期:2007-09-01 00:00:00
abstract:OBJECTIVES:To determine the sensitivity and positive predictive value (PPV) of gadobenate-enhanced MR imaging for the detection of liver metastases. METHODS:This systematic review and meta-analysis was conducted according to PRISMA guidelines. A comprehensive search (EMBASE, PubMed) was performed to identify relevant ...
journal_title:European radiology
pub_type: 杂志文章,meta分析
doi:10.1007/s00330-019-06110-1
更新日期:2019-10-01 00:00:00
abstract::The purpose of our animal study was to evaluate a new computed tomography (CT) subtraction technique for visualization of perfusion defects within the lung parenchyma in subsegmental pulmonary embolism (PE). Seven healthy pigs were entered into a prospective trial. Acute PE was artificially induced by fresh clot mater...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-005-2718-9
更新日期:2005-07-01 00:00:00
abstract:OBJECTIVES:To compare the diagnostic accuracy and sensitivity of Gd-EOB-DTPA MRI and diffusion-weighted (DWI) imaging alone and in combination for detecting colorectal liver metastases in patients who had undergone preoperative chemotherapy. METHODS:Thirty-two consecutive patients with a total of 166 liver lesions wer...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-012-2658-0
更新日期:2013-03-01 00:00:00
abstract:OBJECTIVES:Vascular complications are one of the most common causes of early kidney transplant dysfunction. Contrast enhanced ultrasound increases sensitivity to vascular changes. The aim of this study was to assess the prevalence and size of vascular abnormalities in early renal transplants using 3D CEUS and the signi...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-4871-3
更新日期:2017-11-01 00:00:00
abstract:OBJECTIVES:To evaluate the accuracy of diagnoses of COVID-19 based on chest CT as well as inter-observer agreement between teleradiologists during on-call duty and senior radiologists in suspected COVID-19 patients. MATERIALS AND METHODS:From March 13, 2020, to April 14, 2020, consecutive suspected COVID-19 adult pati...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-020-07345-z
更新日期:2020-10-29 00:00:00
abstract:OBJECTIVES:To comprehensively and quantitatively analyse flow and vorticity in the right heart of patients after repair of tetralogy of Fallot (rTOF) compared with healthy volunteers. METHODS:Time-resolved flow-sensitive 4D MRI was acquired in 24 rTOF patients and 12 volunteers. Qualitative flow evaluation was based o...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-015-4186-1
更新日期:2016-10-01 00:00:00
abstract::This technical note describes the use of dynamic MRI in the diagnosis of groin herniations. A review of the anatomy of the groin is presented and 4 representative cases are described. This paper indicates that dynamic MRI can be used to confirm the diagnosis in patients with clinically evident groin herniations. ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300050377
更新日期:1998-01-01 00:00:00
abstract:OBJECTIVES:To evaluate the effect of hybrid iterative reconstruction on qualitative and quantitative parameters at 256-slice cardiac CT. METHODS:Prospective cardiac CT images from 20 patients were analysed. Paired image sets were created using 3 reconstructions, i.e. filtered back projection (FBP) and moderate- and hi...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-011-2361-6
更新日期:2012-06-01 00:00:00
abstract::Spinal vascular malformations are rare diseases that consist of true inborn cavernomas and arteriovenous malformations (including perimedullary fistulae, glomerular and juvenile AVMs) and presumably acquired dural arteriovenous fistulae. This review article gives an overview of the imaging features both on MRI and ang...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-004-2510-2
更新日期:2005-02-01 00:00:00
abstract:OBJECTIVES:To investigate if brain gamma-aminobutyric acid (GABA) levels in patients with relapsing-remitting multiple sclerosis (RRMS) are abnormal compared with healthy controls, and their relationship to cognitive function in RRMS. METHODS:Twenty-eight RRMS patients and twenty-six healthy controls underwent magneti...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-5064-9
更新日期:2018-03-01 00:00:00
abstract:AIM:To evaluate the accuracy of a T2-weighted (T2w) - and a parallel transmit zoomed b = 2000 s/mm2 (b2000) - diffusion-weighted imaging sequence among three readers with different degrees of experience for prostate cancer (Pca) detection. METHODS:Ninety-three patients with suspected Pca were enrolled. For b2000 a two...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-5004-8
更新日期:2018-02-01 00:00:00
abstract::To evaluate the efficiency of laser thermocoagulation under computed tomography (CT) guidance in the treatment of osteoid osteoma within a strictly pediatric group. Twenty-five patients aged 4 to 17 years were treated under CT by laser thermocoagulation. The nidus measured on average 10.1 mm. Pain relief was the main ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-008-1173-9
更新日期:2009-03-01 00:00:00
abstract:OBJECTIVES:Peripheral bone infection (PBI) and prosthetic joint infection (PJI) are two different infectious conditions of the musculoskeletal system. They have in common to be quite challenging to be diagnosed and no clear diagnostic flowchart has been established. Thus, a conjoined initiative on these two topics has ...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-019-06326-1
更新日期:2019-12-01 00:00:00
abstract::Gadobenate (Gd-BOPTA), injected at a dose of 0.1 mmol/kg body weight, was compared with gadopentetate (Gd-DTPA), injected at a dose of 0.2 mmol/kg body weight, for delineation of myocardial infarction interindividually in two groups of 26 patients each. Delayed enhancement images were assessed subjectively for image q...
journal_title:European radiology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00330-009-1400-z
更新日期:2009-09-01 00:00:00
abstract::Computed tomography with rectal air insufflation was compared with transrectal ultrasonography (TRUS) in 63 patients. The CT protocol involved pre- and postcontrast scans with 5 mm slice thickness following air insufflation in IV antiperistaltic agent. Of the patients, 79 % were scanned in the prone position. Results ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300050102
更新日期:1997-01-01 00:00:00