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unenhanced CT

Antonio Pierro, Savino Cilla, Pietro Modugno, Enrico Maria Centritto, Carlo Maria De Filippo, Giuseppina Sallustio
We described the utility of computed tomography (CT) angiography in detection of bleeding vessels for a rapid percutaneous arterial embolization of the spontaneous rectus sheath hematoma. A 70-year-old woman comes to our attention with acute abdominal pain and a low hemoglobin level. An unenhanced CT was performed demonstrating a large rectus sheath hematoma. A conservative management was initially established. Despite this therapy, the abdominal pain increased together with a further decrease of hemoglobin values...
April 2018: Radiology Case Reports
Fan Fu, Binbin Sui, Liping Liu, Yaping Su, Shengjun Sun, Yingying Li
Background Positive "dynamic spot sign" has been proven to be a potential risk factor for acute intracerebral hemorrhage (ICH) expansion, but local perfusion change has not been quantitatively investigated. Purpose To quantitatively evaluate perfusion changes at the ICH area using computed tomography perfusion (CTP) imaging. Material and Methods Fifty-three patients with spontaneous ICH were recruited. Unenhanced computed tomography (NCCT), CTP within 6 h, and follow-up NCCT were performed for 21 patients in the "spot sign"-positive group and 32 patients in the control group...
January 1, 2018: Acta Radiologica
Z H Liu, J Y Shi, H Y Wang, H Y Ye, Z B Wang, T Yang, X Ma, X Bai
Objective: To explore the value of CT texture analysis (CTTA) in differentiating the pathological grade of urothelial carcinoma of the bladder (UCB). Methods: A total of 53 lesions from 43 patients with bladder cancer confirmed by postoperative pathology were retrospectively analyzed, including 27 cases of high-grade urothelial carcinoma (HGUC) and 26 cases of low-grade urothelial carcinoma (LGUC). All the patients took pelvic CT and enhanced scanning in the same CT scanner with same scanning parameters. Lesions on both plain and enhanced CT images were delineated on software by two radiologists to extract the corresponding volumes of interest (VOI) and then 92 parameters based on feature classes were generated...
May 23, 2018: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
Radosław Samsel, Andrzej Cichocki, Lucyna Papierska, Karolina Nowak, Katarzyna Roszkowska-Purska
Adrenal ganglioneuroma is a rare benign neuroblastic tumor. Most of adrenal ganglioneuromas are asymptomatic and discovered incidentally during imaging examinations performed for many different indications. Proper preoperative diagnosis is challenging and most of this masses are described as being poor lipid adenomas or pheochromocytomas. AIM: The aim of the study was to present experience of referral center with this rare adrenal pathologies. MATERIALS AND METHODS: Analysis of our data - 374 adrenalectomies performed over last 13 years (2004-2016) in patients referred to our department from different endocrinological centers...
May 25, 2018: Polski Merkuriusz Lekarski: Organ Polskiego Towarzystwa Lekarskiego
Yoshinobu Shinagawa, Keiko Sakamoto, Keisuke Sato, Emi Ito, Hiroshi Urakawa, Kengo Yoshimitsu
OBJECTIVES: To assess whether extracellular volume fraction (ECV) obtained from routine liver CT equilibrium phase data utilizing new subtraction algorithm is useful in estimating the degree of liver fibrosis. MATERIALS AND METHODS: Consecutive 41 patients, 21 men and 20 women, with chronic liver diseases who underwent quadri-phase liver CT and MR elastography within 3 months were retrospectively enrolled. Subtraction image of unenhanced from equilibrium phase (240 s) images using conventional and new algorithms were made...
June 2018: European Journal of Radiology
Hassan Boulkhrif, Ha Manh Luu, Theo van Walsum, Adriaan Moelker
OBJECTIVES: To compare the accuracy of liver tumour localisation in intraprocedural computed tomography (CT) images of computer-based rigid registration or non-rigid registration versus mental registration performed by interventional radiologists. METHODS: Retrospectively (2009-2017), 35 contrast-enhanced CT (CECT) images incorporating 56 tumours, acquired during CT-guided ablation procedures and their corresponding pre-procedural diagnostic CECTs were retrieved from the picture archiving and communication system (PACS)...
May 25, 2018: European Radiology
Chengwei Gu, Dong Zeng, Jiahui Lin, Sui Li, Ji He, Hao Zhang, Zhaoying Bian, Shanzhou Niu, Zhang Zhang, Jing Huang, Bo Chen, Dazhe Zhao, Wufan Chen, Jianhua Ma
Myocardial perfusion computed tomography (MPCT) imaging is commonly used to detect myocardial ischemia quantitatively. A limitation in MPCT is that an additional radiation dose is required compared to unenhanced CT due to its repeated dynamic data acquisition. Meanwhile, noise and streak artifacts at low-dose cases are main factors that degrade accuracy of quantifying myocardial ischemia and hamper diagnostic utility of the filtered backprojection reconstructed MPCT images. Moreover, it is noted that the MPCT images are composed by a series of 2/3D images, which can be naturally regarded as a 3/4-order tensor, and the MPCT images are globally correlated along time and sparse across space...
May 24, 2018: Physics in Medicine and Biology
G-M-Y Zhang, H Sun, B Shi, M Xu, H-D Xue, Z-Y Jin
AIM: To evaluate the accuracy of computed tomography (CT) texture analysis (TA) to differentiate uric acid (UA) stones from non-UA stones on unenhanced CT in patients with urinary calculi with ex vivo Fourier transform infrared spectroscopy (FTIR) as the reference standard. MATERIALS AND METHODS: Fourteen patients with 18 UA stones and 31 patients with 32 non-UA stones were included. All the patients had preoperative CT evaluation and subsequent surgical removal of the stones...
May 21, 2018: Clinical Radiology
Han Kyul Kim, Joungho Han, Teri J Franks, Kyung Soo Lee, Tae Jung Kim, Joon Young Choi, Jaeil Zo
OBJECTIVE: We aimed to assess CT and 18 F-FDG PET/CT findings of colloid adenocarcinoma of the lung in seven patients. MATERIALS AND METHODS: From 2010 to 2017, seven patients with surgically proven colloid adenocarcinoma of the lung were identified. CT (both enhanced and unenhanced) and PET/CT findings were analyzed, and the imaging features were compared with histopathologic reports. Clinical and demographic features were also analyzed. RESULTS: In all cases except one, tumors showed low attenuation on unenhanced CT scans, ranging in attenuation from -16...
May 24, 2018: AJR. American Journal of Roentgenology
Dinesh Manoharan, Sanjay Sharma, Chandan J Das, Rajeev Kumar, Geetika Singh, Pratik Kumar
OBJECTIVE: The primary objective of this study was to compare triple-bolus dual-energy CT (DECT) against standard triple-phase MDCT in terms of appropriateness of patient treatment. SUBJECTS AND METHODS: One hundred twenty-four patients with suspected renal masses seen at ultrasound were randomized into triple-bolus DECT and triple-phase MDCT groups. Patients in the triple-bolus DECT group underwent synchronous corticomedullary nephrographic delayed-phase triple-bolus DECT...
May 24, 2018: AJR. American Journal of Roentgenology
Radosław Chaber, Mateusz Łasecki, Justyna Kwaśnicka, Kornelia Łach, Zbigniew Podgajny, Cyprian Olchowy, Urszula Zaleska-Dorobisz
BACKGROUND: The precise identification of the primarily-affected nodal regions in Hodgkin's lymphoma(HL) is essential in determining the stage of the disease and the intensity of chemotherapy and radiotherapy. OBJECTIVES: The aim of this study was to use the degree of X-ray attenuation (XRA) in Hounsfield units(HU) and the lymph node-to-muscle attenuation ratio (LN/M) in computed tomography (CT) unenhancedimaging, routinely performed with 18F-fluorodeoxyglucose positron emission tomography (18F-FDG-PET),to distinguish HL-affected supradiaphragmatic lymph nodes...
May 16, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
Saeed Seyyedi, Eleni Liapi, Tobias Lasser, Robert Ivkov, Rajeev Hatwar, J Webster Stayman
Liver CT perfusion (CTP) is used in the detection, staging, and treatment response analysis of hepatic diseases. Unfortunately, CTP radiation exposures is significant, limiting more widespread use. Traditional CTP data processing reconstructs individual temporal samples, ignoring a large amount of shared anatomical information between temporal samples, suggesting opportunities for improved data processing. We adopt a prior-image-based reconstruction approach called Reconstruction of Difference (RoD) to enable low-exposure CTP acquisition...
May 2018: IEEE Transactions on Radiation and Plasma Medical Sciences
Sébastien Molière, Stéphane Kremer, Guillaume Bierry
History An otherwise healthy 18-year-old man was admitted to the emergency department with a closed displaced fracture of the left femoral shaft ( Fig 1 ) after a high-velocity motorbike accident. At admission, other physical examination findings were unremarkable. Initial unenhanced and contrast material-enhanced (120 mL of Iomeron 400; Bracco Imaging, Milan, Italy) computed tomography (CT) was performed in the arterial and venous phases from the head to the knees. No abnormalities were noted in the brain or chest at initial CT...
June 2018: Radiology
L C Adams, B Ralla, G Engel, G Diederichs, B Hamm, J Busch, F Fuller, M R Makowski
AIM: To test the potential of unenhanced cardiac- and respiratory-motion-corrected three-dimensional steady-state free precession (3D-SSFP) magnetic resonance imaging (MRI) for the assessment of inferior vena cava (IVC) thrombus in patients with clear-cell renal cell carcinoma (cRCC), compared to standard contrast-enhanced (CE)-MRI and CE-computed tomography (CT). MATERIALS AND METHODS: Eighteen patients with cRCC and IVC thrombus, who received CE-MRI and 3D-SSFP at 1...
May 17, 2018: Clinical Radiology
Artur Salmaslıoğlu, Mesut Bulakçı, Barış Bakır, Ravza Yılmaz, Yunus Emre Akpınar, Tzevat Tefik, Öner Şanlı, Sevda Özel, Bülent Acunas
PURPOSE: We aimed to determine the feasibility and effectiveness of agent emission imaging - high mechanical index (AEI-High MI) mode ultrasonography (US) compared with gray-scale and color Doppler US, alone or in combination, for the diagnosis of urolithiasis with reference to unenhanced computed tomography (CT). METHODS: This prospective study included 72 consecutive patients (40 males, 32 females; mean age, 45.9±14.7 years) referred by the department of urology for acute or elective symptoms of urolithiasis and confirmed to have urinary calculi on unenhanced abdominal CT, between January 2015 and June 2015...
May 2018: Diagnostic and Interventional Radiology: Official Journal of the Turkish Society of Radiology
Dong Hoon Lee, Sun Hwa Lee, Je Hyeok Oh, In Soo Cho, Young Hwan Lee, Chul Han, Wook Jin Choi, You Dong Sohn
AIM: Previous studies indicated that the optic nerve sheath diameter (ONSD) measured using brain computed tomography (CT) is a prognostic factor for poor neurological outcome after cardiac arrest. However, these studies were retrospective or included a small sample size. We performed a prospective multi-centre observational study to investigate the correlation between the ONSD on early brain CT and neurological outcomes in patients undergoing targeted temperature management (TTM). METHODS: This study used data from the Korean Hypothermia Network prospective registry between November 2015 and October 2016...
May 12, 2018: Resuscitation
Tianqi Fang, Wei Deng, Martin Wai-Ming Law, Liangping Luo, Liyun Zheng, Ying Guo, Hanwei Chen, Bingsheng Huang
OBJECTIVE: To compare patients' image quality and radiation exposure between gemstone spectral imaging (GSI) with rapid kV switching technique and conventional polychromatic imaging performed in abdominal CT examinations. METHODS: Adult patients who were referred to abdominal CT from October 2015 to March 2016 were enrolled. Unenhanced CT with conventional polychromatic imaging mode and tri-phase (arterial/portal/delayed phase) contrast-enhanced scan with GSI mode were performed with different protocols respectively...
May 15, 2018: British Journal of Radiology
Wenbiao Ren, Bichen Xue, Jiandong Qu, Longfei Liu, Chao Li, Xiongbing Zu
OBJECTIVE: To evaluate the preoperative imaging manifestation and therapeutic effect of laparoscopic simple enucleation (SE) for localized chromophobe renal cell carcinoma (chRCC). MATERIALS AND METHODS: Clinical data of 36 patients who underwent laparoscopic SE of localized chRCC at our institute were retrospectively analyzed. All patients underwent preoperative renal protocol CT (unenhanced, arterial, venous, and delayed images). CT scan characteristics were evaluated...
April 30, 2018: International Braz J Urol: Official Journal of the Brazilian Society of Urology
Yingzhen N Zhang, Kathryn J Fowler, Gavin Hamilton, Jennifer Y Cui, Ethan Z Sy, Michelle Balanay, Jonathan C Hooker, Nikolaus Szeverenyi, Claude B Sirlin
Hepatic steatosis is a frequently encountered imaging finding that may indicate chronic liver disease, the most common of which is non-alcoholic fatty liver disease. Non-alcoholic fatty liver disease is implicated in the development of systemic diseases and its progressive phenotype, non-alcoholic steatohepatitis, leads to increased liver-specific morbidity and mortality. With the rising obesity epidemic and advent of novel therapeutics aimed at altering metabolism, there is a growing need to quantify and monitor liver steatosis...
June 6, 2018: British Journal of Radiology
E Di Caprera, L De Corato, V Giuricin, M C Pensabene, G Marfia, M Melis, F Garaci, R Floris
Cerebral venous sinus thrombosis (CVST) is responsible for 1-2% of all strokes in adults. Venous occlusive disease is a less common condition than the arterial one, but probably underestimated in the past [1]. Its early detection is crucial to ensure appropriate therapy, to prevent irreversible brain injury. The neuroradiological study is crucial to formulate the diagnosis. Unenhanced computed tomography (CT) is usually the first imaging study performed on an emergency basis. We report the case of a woman who present a migrant headache, resistant to the therapy...
2018: European Journal of Radiology Open
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