Helical CT with variable target noise levels for dose reduction in chest, abdomen and pelvis CT

Rogalla, Patrik; Paravasthu, Madhusudan; Farrell, Christin; Kandel, Sonja

doi:10.1007/s00330-018-5315-4

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Supraventricular arrhythmias, such as atrial fibrillation, generally have a long history, significant myocardial fibrosis, more complications, high risk of stroke with drug therapy, poor efficacy, and arrhythmogenic effects with the long-term application of antiarrhythmic drugs in such patients. Therefore, there is much interest in the clinical effectiveness and safety of transcatheter ablation for the treatment of AF [ 19 ]. Current studies suggest that most cases of paroxysmal AF are triggered or driven by the extracardiac abnormal potential sites and the pulmonary veins are the most common sites of origin for such arrhythmias that often cause paroxysmal AF.…”

Section: Related Workmentioning

confidence: 99%

Spiral Computed Tomography in the Quantitative Measurement of the Adjacent Structure of the Left Atrial Appendage in Patients with Atrial Fibrillation

Zhang

Yan

2021

Journal of Healthcare Engineering

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Cardiac arrhythmias are common clinical cardiovascular diseases. Arrhythmias are abnormalities in the frequency, rhythm, site of origin, conduction velocity, or sequence of excitation of the cardiac impulses. Arrhythmia mechanisms include foldback, altered autonomic rhythm, and triggering mechanisms. It can cause palpitations, dizziness, black dawn, syncope, and angina pectoris and can worsen a preexisting cardiac disease, reduce the quality of life, and increase mortality. Also, by making it one of the constant challenges for the clinical cardiovascular physician, we can get more information. The study included 94 patients with atrial fibers, including 56 men and 38 women aged 57, 46, 11, and 68 years. There are 80 patients with nonatrial fibers, including 44 men and 36 women aged 56, 10, and 83 years. Those who can perform a normal coronary angiography and exclude congenital heart disease, heart valve disease, and other cardiovascular diseases. In both groups, a 256-layer spiral CT examination was performed. A pulmonary vein scanning protocol was applied to the patients with atrial fibrillation, and this can perform normal coronary angiography and exclude those with cardiovascular diseases such as congenital heart disease and valvular heart disease. The purpose of this study is to investigate the anatomical changes of the left atrium and its adjacent structures by applying the 256 nm spiral CT imaging to visualize the left atrium and its adjacent structures and by applying the MPR technology, VR technology, and simulation endoscope techniques.

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Section: Related Workmentioning

confidence: 99%

Spiral Computed Tomography in the Quantitative Measurement of the Adjacent Structure of the Left Atrial Appendage in Patients with Atrial Fibrillation

Zhang

Yan

2021

Journal of Healthcare Engineering

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“…Multiple phase contrast enhanced abdominal CT is an inestimable diagnostic tool for patients with kinds of chronic diseases, especially for tumors [1,2]. However, concerns remain about the potential risks of ionizing radiation, particularly for populations that may require serial CT examinations [3][4][5]. Previous studies have reported that the low tube-voltage technique (e.g., 80 kV) could e ciently reduce the radiation dose and increase the contrast enhancement of vascular and parenchymal structures in abdominal contrast enhanced CT[6].…”

Section: Introductionmentioning

confidence: 99%

Reduced-dose deep learning iterative reconstruction for abdominal computed tomography with low tube-voltage and tube-current

Zhu,

Zhang,

Tian

et al. 2024

Preprint

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Background: Low tube-voltage technique (e.g., 80 kV) could efficiently reduce the radiation dose and increase the contrast enhancement of vascular and parenchymal structures in abdominal CT. However, a high tube current is always required in this setting and limits the dose reduction potential. By using a deep learning iterative reconstruction algorithm (Deep IR), this paper aims to investigate the feasibility of a Deep IR in reducing radiation dose while improving the image quality for abdominal computed tomography (CT) with low tube-voltage and tube-current. Methods: Sixty patients (Male/female, 36/24; Age, 57.72±10.19 years) undergoing the abdominal portal venous phase CT were randomly divided into groups A (100 kV, automatic exposure control [AEC] with reference tube-current of 213 mAs) and B (80 kV, AEC with reference of 130 mAs). Images were reconstructed by hybrid iterative reconstruction (HIR) and Deep IR (levels 1-5). The mean CT and standard deviation (SD) values of four regions of interest (ROI), i.e. liver, spleen, main portal vein and erector spinae at the porta hepatis level in each image serial were measured, and signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated. The image quality was subjectively scored by two radiologists using a 5-point criterion. Results: A significant reduction of radiation dose by 69.94% (5.09±0.9 mSv vs. 1.53±0.37 mSv) were detected in group B when compared to group A. With regard to Deep IR algorithm at various levels, there was no significant change in CT value, but SD gradually increased. Group B had higher CT values than group A, and the portal vein CT values significantly differed between groups (P<0.003). The SNR and CNR in group B with Deep IR at levels 1-5 were higher than those in group A and significantly differed when HIR and Deep IR were applied at levels 1-3 of HIR and Deep IR (P<0.003). The subjective scores (distortion, clarity of the portal vein, visibility of small structures and overall image quality) with Deep IR at levels 4-5 in group B were significantly higher than those in group A with HIR (P<0.003). Conclusion: Deep IR algorithm can reduce radiation dose and improve the image quality of parenchymal organs and portal vein clarity in portal venous phase abdominal CT with low tube-voltage and tube-current.

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Comparison of image quality and lesion diagnosis in abdominopelvic unenhanced CT between reduced-dose CT using deep learning post-processing and standard-dose CT using iterative reconstruction: A prospective study

Wang

Zheng

Xiao

et al. 2021

European Journal of Radiology

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Helical CT with variable target noise levels for dose reduction in chest, abdomen and pelvis CT

Abstract: • Low dose chest and standard abdomen CTs can be combined. • Variable SD CT scanning allows for radiation dose reduction. • Variable SD CT scanning maintains image quality.

Cited by 3 publications

References 22 publications

Spiral Computed Tomography in the Quantitative Measurement of the Adjacent Structure of the Left Atrial Appendage in Patients with Atrial Fibrillation

Spiral Computed Tomography in the Quantitative Measurement of the Adjacent Structure of the Left Atrial Appendage in Patients with Atrial Fibrillation

Reduced-dose deep learning iterative reconstruction for abdominal computed tomography with low tube-voltage and tube-current

Comparison of image quality and lesion diagnosis in abdominopelvic unenhanced CT between reduced-dose CT using deep learning post-processing and standard-dose CT using iterative reconstruction: A prospective study

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