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Low dose computed tomography

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https://www.readbyqxmd.com/read/29792729/90-kvp-low-tube-voltage-ct-pulmonary-angiography-in-combination-with-advanced-modelled-iterative-reconstruction-algorithm-effects-on-radiation-dose-image-quality-and-diagnostic-accuracy-for-the-detection-of-pulmonary-embolism
#1
Doris Leithner, Tatjana Gruber-Rouh, Martin Beeres, Julian L Wichmann, Scherwin Mahmoudi, Simon S Martin, Lukas Lenga, Moritz H Albrecht, Christian Booz, Thomas J Vogl, Jan-Erik Scholtz
OBJECTIVE: To evaluate low-tube-voltage 90-kVp computed tomography pulmonary angiography (CTPA) with advanced modelled iterative reconstruction algorithm (Admire) compared to 120-kVp equivalent dual-energy acquisition with regards to radiation exposure, image quality, and diagnostic accuracy for pulmonary embolism (PE) assessment. METHODS: CTPA studies of 40 patients with suspected PE (56.7 ± 16.3 years) performed on a third-generation 192-slice dual-source CT scanner were retrospectively included...
May 24, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29792040/lung-cancer-screening-with-mri-characterization-of-nodules-with-different-non-enhanced-mri-sequences
#2
Michael Meier-Schroers, Rami Homsi, Hans Heinz Schild, Daniel Thomas
Background There is increased interest in pulmonary magnetic resonance imaging (MRI) as a radiation-free alternative to computed tomography (CT) for lung cancer screening. Purpose To analyze MRI characteristics of pulmonary nodules with different non-enhanced sequences. Material and Methods Eighty-two participants of a lung cancer screening were included. MRI datasets of 32 individuals with 46 different nodules ≥ 6 mm were prospectively evaluated together with 50 controls by two readers. Acquired sequences were T2- short tau inversion recovery (STIR), T2, balanced steady-state free precession (bSSFP), 3D-T1, and diffusion-weighted imaging (DWI)...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29791199/localization-of-the-inferior-alveolar-canal-using-ultralow-dose-ct-with-iterative-reconstruction-techniques
#3
Asma'a Abdulrahman Al-Ekrish, Wafa Alfaleh, Romed Hörmann, Ameera Alabdulwahid, Wolfgang Puelacher, Gerlig Widmann
OBJECTIVES: To compare subjective and objective localization of the inferior alveolar canal (IAC) on multidetector computed tomography (MDCT) images obtained by ultralow doses in combination with the reconstruction techniques of filtered backprojection (FBP), Adaptive Statistical Iterative Reconstruction (ASIR), or Model Based Iterative Reconstruction (MBIR) as compared to standard dose MDCT and FBP. METHODS: Three cadavers were imaged with a reference standard dose MDCT examination (CTDIvol: 29...
May 23, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29790300/aspiration-pneumonia-induces-muscle-atrophy-in-the-respiratory-skeletal-and-swallowing-systems
#4
Riyo Komatsu, Tatsuma Okazaki, Satoru Ebihara, Makoto Kobayashi, Yoko Tsukita, Mayumi Nihei, Hisatoshi Sugiura, Kaijun Niu, Takae Ebihara, Masakazu Ichinose
BACKGROUND: Repetition of the onset of aspiration pneumonia in aged patients is common and causes chronic inflammation. The inflammation induces proinflammatory cytokine production and atrophy in the muscles. The proinflammatory cytokines induce muscle proteolysis by activating calpains and caspase-3, followed by further degradation by the ubiquitin-proteasome system. Autophagy is another pathway of muscle atrophy. However, little is known about the relationship between aspiration pneumonia and muscle...
May 22, 2018: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/29789994/performance-evaluation-of-a-semi-automated-method-for-18-f-fdg-uptake-in-abdominal-visceral-adipose-tissue
#5
Stefanie A de Boer, Daan S Spoor, Riemer H J A Slart, Douwe J Mulder, Melanie Reijrink, Ronald J H Borra, Gerbrand M Kramer, Otto S Hoekstra, Ronald Boellaard, Marcel J Greuter
PURPOSE: Severity of abdominal obesity and possibly levels of metabolic activity of abdominal visceral adipose tissue (VAT) are associated with an increased risk for cardiovascular disease (CVD). In this context, the purpose of the current study was to evaluate the reproducibility and repeatability of a semi-automated method for assessment of the metabolic activity of VAT using 2-deoxy-2-[18 F]fluoro-D-glucose ([18 F]FDG) positron emission tomography (PET)/x-ray computed tomography (CT)...
May 22, 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/29789875/ct-angiography-in-the-lower-extremity-peripheral-artery-disease-feasibility-of-an-ultra-low-volume-contrast-media-protocol
#6
Barbora Horehledova, Casper Mihl, Gianluca Milanese, Rutger Brans, Nienke G Eijsvoogel, Babs M F Hendriks, Joachim E Wildberger, Marco Das
PURPOSE: The ALARA principle is not only relevant for effective dose (ED) reduction, but also applicable for contrast media (CM) management. Therefore, the aim was to evaluate the feasibility of an ultra-low CM protocol in the assessment of peripheral artery disease (PAD). MATERIALS AND METHODS: Fifty PAD patients were scanned on third-generation dual-source computed tomography, from diaphragm to the forefoot, as follows: tube voltage: 70 kV, reference effective tube current: 90 mAs, collimation: 192 × 2 × 0...
May 22, 2018: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29785666/evaluation-of-ostarine-as-a-selective-androgen-receptor-modulator-in-a-rat-model-of-postmenopausal-osteoporosis
#7
D B Hoffmann, M Komrakova, S Pflug, M von Oertzen, D Saul, L Weiser, T A Walde, M Wassmann, A F Schilling, W Lehmann, S Sehmisch
Selective androgen receptor modulators (SARMs) have shown beneficial effects on muscle wasting, general physical function and bone properties in male mammals. However, data on the effects of SARMs in postmenopausal osteoporotic bone are scarce. We evaluated the effects of the SARM drug ostarine on postmenopausal osteoporotic bone in a rat osteoporosis model. Ovariectomy was performed on 46 of 56 3-month-old female Sprague-Dawley rats. Eight weeks after ovariectomy, ostarine was orally administered daily for 5 weeks in dosages of 0...
May 21, 2018: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/29780635/liquid-biopsy-for-lung-cancer-early-detection
#8
REVIEW
Mariacarmela Santarpia, Alessia Liguori, Alessandro D'Aveni, Niki Karachaliou, Maria Gonzalez-Cao, Maria Grazia Daffinà, Chiara Lazzari, Giuseppe Altavilla, Rafael Rosell
Molecularly targeted therapies and immune checkpoint inhibitors have markedly improved the therapeutic management of advanced lung cancer. However, it still remains the leading cause of cancer-related mortality worldwide, with disease stage at diagnosis representing the main prognostic factor. Detection of lung cancer at an earlier stage of disease, potentially susceptible of curative resection, can be critical to improve patients survival. Low-dose computed tomography (LDCT) screening of high-risk patients has been demonstrated to reduce mortality from lung cancer, but can be also associated with high false-positive rate, thus often resulting in unnecessary interventions for patients...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29780632/management-pathways-for-solitary-pulmonary-nodules
#9
REVIEW
Masaoki Ito, Yoshihiro Miyata, Morihito Okada
Pulmonary nodules are often detected during the clinical course of several diseases or through routine screening. Various guidelines have proposed management algorithms for suspicious solitary nodules in lung cancer. Generally, solitary pulmonary nodules are managed according to nodule appearance and risk of lung cancer using low-dose, thin section computed tomography (CT). Liquid biopsy is promising for diagnosis, therapeutic-monitoring and follow-up in lung cancer; however, diagnosis and management pathways based on genetic examination alone have not been established...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29780631/screening-for-early-stage-lung-cancer-and-its-correlation-with-lung-nodule-detection
#10
REVIEW
Fangfei Qian, Wenjia Yang, Qunhui Chen, Xueyan Zhang, Baohui Han
Currently, the most effective way of reducing lung cancer mortality is early diagnosis of lung cancer. The National Lung Screening Trial has proved the efficacy of lung cancer screening using low-dose computed tomography to reduce lung cancer mortality. However, many questions remain surrounding lung cancer screening implementation, among which include how to select the optimal risk population, the personalized screening interval based different levels of risk, methods to improve diagnostic discrimination between malignant and benign disease in detected lung nodules, and the roles of biomolecular markers in stratifying risk and in guiding the management of indeterminate nodules...
April 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29779936/early-response-assessment-on-mid-treatment-computed-tomography-predicts-for-locoregional-recurrence-in-oropharyngeal-cancer-patients-treated-with-definitive-radiation-therapy
#11
Rafi Kabarriti, N Patrik Brodin, George Lundgren, Nitin Ohri, Wolfgang A Tomé, Shalom Kalnicki, Madhur K Garg
PURPOSE: To evaluate whether a response assessment using mid-treatment computed tomography (CT) scans during definitive radiation therapy (RT) for oropharyngeal head and neck cancer can predict for locoregional recurrence (LRR). METHODS AND MATERIALS: Head and neck cancer patients who receive RT at our institution undergo CT repeat scans at the 15th fraction, with treatment replanning in the case of an inadequate dose to gross disease or an increased dose to organs at risk...
April 6, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29779857/factors-affecting-the-incidence-of-contrast-induced-nephropathy-in-patients-undergoing-computed-tomography
#12
M Heras Benito, M Garrido Blázquez, Y Gómez Sanz, M Bernardez Mardomingo, J Ruiz Cacho, F J Rodríguez Recio, M J Fernández-Reyes Luis
OBJECTIVE: To analyze the incidence of contrast-induced nephropathy in a cohort of patients undergoing computed tomography (CT) with intravenous iodinated contrast material. To evaluate the efficacy of N-acetylcysteine in preventing contrast-induced nephropathy. PATIENTS AND METHODS: This prospective observational study was carried out in the months comprising March 2016 through July 2016. We selected the first five patients scheduled to undergo CT examination each day who agreed to participate and signed the informed consent form...
May 17, 2018: Radiología
https://www.readbyqxmd.com/read/29775805/new-subsolid-pulmonary-nodules-in-lung-cancer-screening-a-brief-report-of-the-nelson-trial
#13
Joan E Walter, Marjolein A Heuvelmans, Uraujh Yousaf-Khan, Monique D Dorrius, Erik Thunnissen, Anna Schermann, Harry J M Groen, Carlijn M van der Aalst, Kristiaan Nackaerts, Rozemarijn Vliegenthart, Harry J de Koning, Matthijs Oudkerk
INTRODUCTION: Low-dose computed tomography (LDCT) lung cancer screening is recommended in the United States. While new solid nodules after baseline screening have a high lung cancer probability at small size and require lower size cutoff values than baseline nodules, there only is limited evidence on management of new subsolid nodules. METHODS: Within the Dutch-Belgian randomized controlled LDCT lung cancer screening trial (NELSON), 7557 participants underwent baseline screening between April 2004 and December 2006...
May 15, 2018: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/29772061/an-image-guided-radiotherapy-decision-support-framework-incorporating-a-bayesian-network-and-visualization-tool
#14
Catriona Hargrave, Timothy Deegan, Tomasz Bednarz, Michael Poulsen, Fiona Harden, Kerrie Mengersen
PURPOSE: To describe a Bayesian network (BN) and complementary visualization tool, that aim to support decision-making during online cone-beam computed tomography (CBCT)-based image guide radiotherapy (IGRT) for prostate cancer patients. METHODS: The BN was created to represent relationships between observed prostate, proximal seminal vesicle (PSV), bladder and rectum volume variations, an image feature alignment score (FASTV _ OAR ), delivered dose and treatment plan compliance (TPC)...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29770769/ct-fluoroscopy-guided-percutaneous-osteoplasty-with-or-without-radiofrequency-ablation-in-the-treatment-of-painful-extraspinal-and-spinal-bone-metastases-technical-outcome-and-complications-in-29-patients
#15
Caroline A Burgard, Julien Dinkel, Frederik Strobl, Philipp M Paprottka, Nicolai Schramm, Maximilian Reiser, Christoph G Trumm
PURPOSE: We aimed to assess the safety and technical outcome of computed tomography (CT) fluoroscopy-guided osteoplasty with or without prior percutaneous radiofrequency ablation (RFA) in patients with painful osteolyses. METHODS: We performed a retrospective analysis of 29 patients with painful extraspinal and spinal osteolyses (16 women, 13 men; 63.1±14.4 years) who underwent CT fluoroscopy-guided osteoplasty (10-20 mAs tube current) with or without RFA (26 and 14 lesions, respectively), in 33 consecutive procedures from 2002 to 2016...
May 2018: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
https://www.readbyqxmd.com/read/29769130/diagnostic-accuracy-of-low-dose-dual-source-cardiac-computed-tomography-as-compared-to-surgery-in-univentricular-heart-patients
#16
Narumol Chaosuwannakit, Pattarapong Makarawate
BACKGROUND: To evaluate the ability of low radiation dose dual-source computed tomography (DSCT) to depict the features of morphological univentricular heart and to define accuracy by comparing findings with surgery. METHODS: Low radiation dose dual-source cardiac computed tomography (CCT) of 33 cases of functional univentricular heart preliminary diagnosis by echocardiography compared with the results of surgery were retrospectively analyzed (aged 1 day to 4 years, median 5 months)...
May 16, 2018: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29765233/patterns-of-local-failures-and-suggestions-for-reduction-of-clinical-target-volume-for-nasopharyngeal-carcinoma-patients-without-cervical-lymph-node-metastasis
#17
Yujiao Li, Xiaomin Ou, Chunying Shen, Tingting Xu, Weiwei Li, Chaosu Hu
Background: To demonstrate the robustness of clinical target volume delineation for nasopharyngeal carcinoma (NPC) patients, this study makes a detailed analysis of the initial irradiated dose of the recurrent site and local failure patterns after intensity-modulated radiation therapy (IMRT). Based on this analysis, further improvement of delineation recommendations may be made in order to improve the quality-of-life in NPC, without decreasing the local control and survival rate. Methods: In total, 382 newly diagnosed non-metastatic NPC patients were retrospectively enrolled, receiving elective neck irradiation to levels II, III, and VA...
2018: OncoTargets and Therapy
https://www.readbyqxmd.com/read/29764769/comparison-of-computed-tomography-with-magnetic-resonance-imaging-for-imaging-based-clinical-target-volume-contours-in-cervical-cancer-brachytherapy
#18
Agnieszka Zolciak-Siwinska, Adam Kowalczyk, Katarzyna Sikorska, Michal Bijok, Wojciech Michalski, Ewelina Gruszczynska
PURPOSE: To compare CT- and MRI-based brachytherapy (BT) target volumes for patients with advanced cervical cancer so as to identify those who benefit most from MRI-based planning. We also studied how the natural mobility of the organ at risks (OARs) affects the given doses. METHODS AND MATERIALS: Subjects were 60 patients with International Federation of Gynecology and Obstetrics (FIGO) Stage IB-IVA cervical cancer. The CT high-risk clinical target volume (HR-CTV) was first delineated, then the MRI HR-CTV, with volume discrepancies calculated by subtraction...
May 12, 2018: Brachytherapy
https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#19
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29755904/radiation-induced-cavernous-malformation-as-a-late-sequelae-of-stereotactic-radiosurgery-for-epilepsy
#20
Ethan A Winkler, Caleb Rutledge, Mariann Ward, Tarik Tihan, Patricia K Sneed, Nicholas Barbaro, Paul Garcia, Michael McDermott, Edward F Chang
Stereotactic radiosurgery (SRS) is a promising treatment for medically intractable mesial temporal lobe epilepsy. SRS for epilepsy has had an acceptable safety profile with reports of radiation-induced vascular malformations confined to central nervous system pathologies with prominent angiogenesis - namely, primary brain tumors, metastases, and arteriovenous malformations. Theoretical risks for radiation-induced lesions following radiosurgery for epilepsy have yet to be established. Of 13 patients treated in a pilot trial for medial temporal lobe epilepsy, one developed multiple delayed radiation-induced cavernous malformations following radiosurgery...
March 11, 2018: Curēus
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