Abstract:
OBJECTIVES:To explain the technical principles of and differences between commercially available iterative reconstruction (IR) algorithms for computed tomography (CT) in non-mathematical terms for radiologists and clinicians. METHODS:Technical details of the different proprietary IR techniques were distilled from available scientific articles and manufacturers' white papers and were verified by the manufacturers. Clinical results were obtained from a literature search spanning January 2006 to January 2012, including only original research papers concerning IR for CT. RESULTS:IR for CT iteratively reduces noise and artefacts in either image space or raw data, or both. Reported dose reductions ranged from 23 % to 76 % compared to locally used default filtered back-projection (FBP) settings, with similar noise, artefacts, subjective, and objective image quality. CONCLUSION:IR has the potential to allow reducing the radiation dose while preserving image quality. Disadvantages of IR include blotchy image appearance and longer computational time. Future studies need to address differences between IR algorithms for clinical low-dose CT. KEY POINTS:• Iterative reconstruction technology for CT is presented in non-mathematical terms. • IR reduces noise and artefacts compared to filtered back-projection. • IR can improve image quality in routine-dose CT and lower the radiation dose. • IR's disadvantages include longer computation and blotchy appearance of some images.
journal_name
Eur Radioljournal_title
European radiologyauthors
Willemink MJ,de Jong PA,Leiner T,de Heer LM,Nievelstein RA,Budde RP,Schilham AMdoi
10.1007/s00330-012-2765-ysubject
Has Abstractpub_date
2013-06-01 00:00:00pages
1623-31issue
6eissn
0938-7994issn
1432-1084journal_volume
23pub_type
杂志文章abstract::Our objective was to study Gd-EOB-DTPA for the characterization of focal liver lesions by means of dynamic MR imaging. A double-blind and randomized dose-ranging phase-2 clinical trial was performed in 31 patients (liver metastases n = 23, hepatocellular carcinoma n = 4, and hemangioma n = 4) at a field strength of 1....
journal_title:European radiology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/s003300050150
更新日期:1997-01-01 00:00:00
abstract::Vertebral fractures are the hallmark of osteoporosis and are associated with increased morbility and mortality. Because a majority of vertebral fractures often occur in absence of specific trauma and are asymptomatic, their identification is radiographic. The two most widely used methods to determine the severity of v...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-008-0899-8
更新日期:2008-07-01 00:00:00
abstract::In the past two decades acquired immunodeficiency syndrome (AIDS) has become one of the most devastating illnesses in human history. As the epidemic continues to spread increasingly, AIDS patients are no longer confined to a few specialized AIDS hospitals and are now seen in general hospitals and clinics everywhere. R...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-003-2065-7
更新日期:2004-03-01 00:00:00
abstract:OBJECTIVES:To evaluate visualization of the right adrenal vein (RAV) with multidetector CT and non-contrast-enhanced MR imaging in patients with primary aldosteronism. METHODS:A total of 125 patients (67 men) scheduled for adrenal venous sampling (AVS) were included. Dynamic 64-detector-row CT and balanced steady-stat...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-015-3872-3
更新日期:2016-03-01 00:00:00
abstract:OBJECTIVES:To determine lumbar intervertebral disc properties with shear wave elastography in adolescent idiopathic scoliotic (AIS) patients before and after surgery, and compare them with asymptomatic controls. METHODS:Twenty-five severe AIS patients with an indication for fusion surgery (15 ± 1.5 years old, the Cobb...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-019-06563-4
更新日期:2020-04-01 00:00:00
abstract:OBJECTIVES:High radiation dose during CT perfusion (CTp) studies contributes to prevent CTp application in daily clinical practice. This work evaluates the consequences of scan delay on perfusion parameters and provides guidelines to help reducing the radiation dose by choosing the most appropriate delay. METHODS:Fift...
journal_title:European radiology
pub_type: 杂志文章,多中心研究
doi:10.1007/s00330-019-06259-9
更新日期:2019-12-01 00:00:00
abstract::Osteochondritis (osteochondrosis) dissecans (OCD) is a common condition in children, adolescents, and young adults. Describing OCD together with osteochondral fractures and epiphyseal ossification disturbances and considering these three conditions as one entity has caused much confusion. Age distribution and localiza...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s003300050348
更新日期:1998-01-01 00:00:00
abstract:OBJECTIVES:To evaluate tomosynthesis compared with 2D-mammography in cancer detection and recalls in a screening-programme, and assess performing synthesized instead of 2D, and compare double reading of 2D with single reading of tomosynthesis. METHODS:Women (age 50-69 years) participating in the screening-programme we...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-5219-8
更新日期:2018-06-01 00:00:00
abstract:OBJECTIVES:To assess whether using the Tree flowchart obviates unnecessary magnetic resonance imaging (MRI)-guided biopsies in breast lesions only visible on MRI. METHODS:This retrospective IRB-approved study evaluated consecutive suspicious (BI-RADS 4) breast lesions only visible on MRI that were referred to our inst...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-017-4755-6
更新日期:2017-09-01 00:00:00
abstract::The effect of stereotactic thalamotomy was assessed with pre- and postoperative functional magnetic resonance imaging (fMRI) under motor stimulation. A patient with unilateral essential tremor (ET) of the left arm underwent stereotactically guided thalamotomy of the right ventral intermediate thalamic nucleus (VIM). F...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-006-0211-8
更新日期:2006-10-01 00:00:00
abstract::The purpose was to evaluate the accuracy of multidetector CT (MDCT) on a 16-row CT scanner in local staging of endometrial carcinoma and more specifically in the assessment of the depth of myometrial invasion and presence of cervical infiltration. This prospective study includes 21 women with newly diagnosed endometri...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-007-0839-z
更新日期:2008-05-01 00:00:00
abstract::This study aims to evaluate the diagnostic accuracy of 16-row multidetector CT (MDCT) and vessel probe reconstructions in the T staging of gastric carcinoma. Fifty-three patients (39 men, 14 women, mean age 57.5) with an endoscopic diagnosis of gastric adenocarcinoma underwent CT examination. A hypotonic drug was admi...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-009-1482-7
更新日期:2010-01-01 00:00:00
abstract::The purpose of this study was to compare LV function and mass quantification derived from cardiac dual-source CT (DSCT) exams with those obtained by MRI in heart transplant recipients. Twelve heart transplant recipients who underwent cardiac DSCT and MRI examination were included. Double-oblique short-axis 8-mm slice ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-008-0949-2
更新日期:2008-09-01 00:00:00
abstract::The aim of this study was to assess whether magnetic resonance imaging could predict the outcome of attempted vaginal delivery in a group of pregnant women whose parturition had to be induced by oxytocin. The signal intensity and morphology alterations in the cervix of 21 full-term pregnant women were analyzed before ...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300051001
更新日期:2000-01-01 00:00:00
abstract:OBJECTIVES:To investigate the dynamic changes in airways in response to methacholine and salbutamol inhalation and to correlate the xenon ventilation index on xenon-enhanced chest CTs in asthmatics. METHODS:Thirty-one non-smokers (6 normal, 25 asthmatics) underwent xenon-enhanced chest CT and pulmonary function tests....
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-012-2516-0
更新日期:2012-11-01 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:OBJECTIVES:We studied the usefulness of early dynamic (ED) and whole-body (WB) FDG-PET/CT for the evaluation of renal cell carcinoma (RCC). METHODS:One hundred patients with 107 tumours underwent kidney ED and WB FDG-PET/CT. We visually and semiquantitatively evaluated the FDG accumulation in RCCs in the ED and WB pha...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-015-4026-3
更新日期:2016-06-01 00:00:00
abstract::Hybrid imaging with combined positron emission tomography/computed tomography (PET/CT) plays an important role in the staging and management of a wide variety of solid tumours. However, its use in the evaluation of musculoskeletal malignancy has not yet entered routine clinical practice. Cross-sectional imaging with m...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-010-1862-z
更新日期:2010-12-01 00:00:00
abstract:OBJECTIVES:To compare the diagnostic accuracy of 3D versus 2D contrast-enhanced vessel-wall (CE-VW) MRI of extracranial and intracranial arteries in the diagnosis of GCA. METHODS:This prospective two-center study was approved by a national research ethics board and enrolled participants from December 2014 to October 2...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-019-06536-7
更新日期:2020-04-01 00:00:00
abstract::Laparoscopic techniques are evolving for a wide range of surgical procedures although they were initially confined to cholecystectomy and exploratory laparoscopy. Recently, surgical procedures performed with a laparoscope include splenectomy, adrenalectomy, gastrectomy, and myomectomy. In this article, we review the s...
journal_title:European radiology
pub_type: 杂志文章,评审
doi:10.1007/s00330-005-0135-8
更新日期:2006-09-01 00:00:00
abstract:OBJECTIVES:The purpose of this study was to compare the image quality of coronary computed tomography angiography (CTA) subjected to deep learning-based image restoration (DLR) method with images subjected to hybrid iterative reconstruction (IR). METHODS:We enrolled 30 patients (22 men, 8 women) who underwent coronary...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-019-06183-y
更新日期:2019-10-01 00:00:00
abstract::The purpose of the present study was to evaluate the usefulness of a new gray-scale test pattern (NGTP) that was developed to easily adjust the gradients of thoracic CT imaging and enable visual consistency. The Society of Motion Picture and Television Engineers (SMPTE) pattern and the NGTP were used for comparison. T...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-004-2315-3
更新日期:2004-12-01 00:00:00
abstract::We report a case of a 22-year-old male with Hunter syndrome who developed progressive major airway obstruction and was treated with insertion of plastic and metallic stents, with dramatic improvement in the patient's symptomatic and functional status. To the best of our knowledge, this is the first reported case of en...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300100932
更新日期:2002-02-01 00:00:00
abstract:OBJECTIVES:To compare the significance of the two-compartment model, considering diffusional anisotropy with conventional diffusion analyzing methods regarding the detection of occult changes in normal-appearing white matter (NAWM) of multiple sclerosis (MS). METHODS:Diffusion-weighted images (nine b-values with six d...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-014-3572-4
更新日期:2015-06-01 00:00:00
abstract:KEY POINT:• The term "pericolic" is wrongly used to describe an abscess adjacent to the colon in patients with acute diverticulitis. We explain why the proper term is the word "paracolic." ...
journal_title:European radiology
pub_type: 信件
doi:10.1007/s00330-018-5827-y
更新日期:2019-08-01 00:00:00
abstract:PURPOSE:The purpose of this study was to compare three different biopsy devices on false-negative and underestimation rates in MR-guided, vacuum-assisted breast biopsy (VABB) of MRI-only lesions. METHODS:This retrospective, single-center study was IRB-approved. Informed consent was waived. 467 consecutive patients und...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-016-4267-9
更新日期:2016-11-01 00:00:00
abstract:OBJECTIVES:To retrospectively determine incidence of early arterial blood flow stasis and its influencing factors during resin-based radioembolization (RE) of liver tumours. METHODS:Data of patients undergoing resin-based RE from 06/2006-12/2013 were reviewed. Second RE procedures of the same liver lobe were excluded....
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-015-4076-6
更新日期:2016-08-01 00:00:00
abstract::Systemic mastocytosis (SM) is an abnormal proliferation of mast cells, located in different structures: skin, bone marrow, spleen, liver and lymph nodes. Magnetic resonance imaging was prospectively performed in ten patients diagnosed by bone marrow biopsy in order to describe the different patterns of bone marrow inv...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300050796
更新日期:1999-01-01 00:00:00
abstract:OBJECTIVES:To retrospectively assess the periablational 3D safety margin in patients with colorectal liver metastases (CRLM) referred for stereotactic radiofrequency ablation (RFA) and to evaluate its influence on local treatment success. METHODS:Forty-five patients (31 males; mean age 64.5 [range 31-87 years]) with 7...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s00330-020-07579-x
更新日期:2021-01-14 00:00:00
abstract::Obstructive azoospermia represents approximately 10 % of cases of male hypofertility. It is classified according to the volume of ejaculate. When the latter is normal a proximal obstruction is suspected. Scrotal sonography can help to detect dilation of the epididymal head when clinical findings are equivocal. Ejacula...
journal_title:European radiology
pub_type: 杂志文章
doi:10.1007/s003300050258
更新日期:1997-01-01 00:00:00