Quantitative evaluation of norcholesterol scintigraphy, CT attenuation value, and chemical-shift MR imaging for characterizing adrenal adenomas

2008 ◽  
Vol 22 (6) ◽  
pp. 513-519 ◽  
Author(s):  
Teruaki Yoh ◽  
Makoto Hosono ◽  
Yoshihiro Komeya ◽  
Sung-Woon Im ◽  
Ryuichiro Ashikaga ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Mr Imaging ◽  
Quantitative Evaluation ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Ct Attenuation Value

Computed Tomography (CT) Attenuation Value in Relation with Body Dimension, Gender and Age in Malay population: A Literature Review

2020 ◽  
Vol 5 (1) ◽  
pp. 12
Author(s):  
Siti Aisyah Munirah Bohang ◽  
Zainul Ibrahim Zainuddin ◽  
Norhanna Suhoimi
Keyword(s):  
English Language ◽  
Region Of Interest ◽  
Time Frame ◽  
Future Research ◽  
Body Dimension ◽  
Attenuation Value ◽  
Gender And Age ◽  
Ct Attenuation ◽  
Malay Population ◽  
Ct Attenuation Value

Interaction of CT’s x-ray beams with patient resulted in attenuation process and there are various factors affecting CT attenuation values. The aim of this review is to examine the existed literatures regarding the concept of attenuation in CT and its relationship with body dimension, gender and age in Malay population. Guided by primary question, literature searches were conducted using the established online database; SCOPUS and PubMed. The time frame for literatures was from 2000 to 2019 and only literatures in English language were selected. The size of body dimension has affected the CT attenuation value but it also depending on the type of tissue presence within the region of interest (ROI) such as muscle and fat tissues. Due to larger body framework and higher amount of skeletal muscle mass theoretically males would have higher CT attenuation value than female. CT attenuation value reduces with aging process. Asians including Malay population have smaller body dimension than Caucasians and the mean attenuation value of abdominal region in Asians could differ from 20 HU. Thus, there is a need for future research to investigate the interrelatedness of attenuation in CT (HU) and body dimension within Malay population and close this gap of knowledge. 

scholarly journals CT differentiation of gastric ectopic pancreas from gastric stromal tumors

2020 ◽  
Author(s):  
Jian Wang ◽  
Chang LIU ◽  
Fang Yang ◽  
Wenming Zhang ◽  
Weiqun Ao ◽  
...  
Keyword(s):  
Univariate Analysis ◽  
Ectopic Pancreas ◽  
Arterial Phase ◽  
Portal Venous Phase ◽  
Test Efficiency ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Venous Phase ◽  
Ct Attenuation Value ◽  
Ct Features

Abstract BackgroundGastric ectopic pancreas (GEPs) is a rare developmental anomaly which is difficult to differentiate it from submucosal tumor such as gastrointestinal stromal tumor (GIST) by imaging methods. So we retrospectively investigated the CT features of them to help us make the correct diagnosis.Materials and MethodsThis study enrolled 17 GEPs and 119 GSTs, which were proven pathologically. We assessed clinical and CT features to identify significant differential features of GEPs from GSTs using univariate and multivariate analyses.ResultsIn univariate analysis, among all clinicoradiologic features, features of age, symptom, tumor marker, location, contour, blurred serosa or fat-line of peritumor, necrosis, calcification, CT attenuation value of unenhancement phase/arterial phase/portal venous phase (CTu/CTa/CTp), the CT attenuation value of arterial phase/portal venous phase minus that of unenhanced phase (DEAP/DEPP), long diameter (LD), short diameter (SD) were considered statistically significant for the differentiation of them. And the multivariate analysis revealed that location, blurred serosa or fat-line of peritumor, necrosis and DEPP were independent factors affecting the identification of them.What's more, ROC analysis showed that the test efficiency of CTp was perfect(AUC= 0.900).ConclusionLocation, blurred serosa or fat-line of peritumor, necrosis and DEPP are useful CT differentiators of GEPs from GSTs. In addition, the test efficiency of CTp in differentiating them was perfect (AUC=0.900).

Pulmonary pure ground-glass opacity lesions: Use of computed tomography attenuation for predicting tumor progression.

2013 ◽  
Vol 31 (15_suppl) ◽  
pp. 7548-7548
Author(s):  
Takashi Eguchi ◽  
Ryoichi Kondo ◽  
Satoshi Kawakami ◽  
Mina Matsushita ◽  
Tetsu Takeda ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Ground Glass Opacity ◽  
Attenuation Value ◽  
Kaplan Meier ◽  
Ct Attenuation ◽  
Long Term Follow Up ◽  
The Difference ◽  
Ct Attenuation Value

7548 Background: Cases with pure ground-glass opacity (GGO) are increasing with the use of computed tomography (CT). In some cases, pure GGO on follow-up CT may represent tumor enlargement or the presence of solid components. We evaluated the natural progression of pure GGO lesions during a long-term follow-up period of more than 2 years. Methods: We retrospectively investigated 95 patients with pure GGO lesions detected between February 2003 and December 2010, in whom these lesions were monitored using CT for more than 2 years. Results: The median follow-up period was 64.7 months (range, 24–114 months). During the follow-up period, areas showing GGO increased in size or appeared to have solid components in 49 patients (group 1) and showed no change in 46 patients (group 2). We compared patient characteristics and tumor properties between the 2 groups. Mean CT attenuation values of the tumors differed significantly between groups 1 (-639.9 ± 88.9 HU) and 2 (-709.2 ± 60.9 HU). In contrast, no significant differences were noted with regard to age, gender, smoking history, lung cancer history, tumor size, and total numbers of GGO lesions between the 2 groups. The difference in the time to tumor growth according to the initial mean CT attenuation value was estimated using the Kaplan–Meier method. The growth incidence at 114 months for lesions with a mean CT attenuation value of -650 HU or more (n = 35) and less than -650 HU (n = 60) were estimated to be 96% and 48%, respectively. The difference between the 2 Kaplan–Meier curves was statistically significant (p < 0.0001). The usefulness of the mean CT attenuation value in predicting the growth of GGO lesions was evaluated using receiver operating characteristic analysis. The sensitivity and specificity was 63% and 87%, respectively, for a mean CT attenuation cutoff value of -650 HU. The area under the curve was 0.76. Conclusions: Many pure GGO lesions have potential for growth as seen during long-term follow-up. CT attenuation is useful in predicting the growth of GGO lesions.

scholarly journals Bone islands incidentally detected on computed tomography: frequency of enostosis and differentiation from untreated osteoblastic metastases based on CT attenuation value

2019 ◽  
Vol 92 (1103) ◽  
pp. 20190249 ◽  
Author(s):  
Francesco Sala ◽  
Annarita Dapoto ◽  
C. Morzenti ◽  
Maria cristina firetto ◽  
Clarissa Valle ◽  
...  
Keyword(s):  
Area Under The Curve ◽  
Region Of Interest ◽  
Average Density ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Bone Island ◽  
Polytrauma Patients ◽  
Ct Density ◽  
Ct Attenuation Value ◽  
Age Range

Objective: The frequency of enostosis incidentally found on CT and CT attenuation value to distinguish them from untreated osteoblastic metastases (UOM). Methods: Enostosis group: 46 polytrauma patients underwent thoracoabdominal CT. Inclusion criteria: age range 14–35 years. Exclusion criteria: cancer, previous fractures. UOM group: 20 patients with radiological diagnosis of UOM. Analyzed data: number, size, location and density of enostoses and metastases. The density was measured with the broadest possible region of interest at the center of the lesion by two radiologists independently. Receiver operatingcharacteristic analysis to determine the sensitivity and specificity, area under the curve 95% confidence intervals and cutoff values of CT density to differentiate metastases from enostoses. Results: Patients were 28 ± 7 years old (72% males). 41 (89%) patients had 124 enostoses (2–15 mm) with an average density of 1007 ± 122 Hounsfiled unit (HU, observer1) and 1052 ± 107 (observer2). The most common sites of occurrence were the proximal femur (34%), the pelvis (22%), the acetabulum (20%), the proximal humerus (11%), the vertebrae (11%) and the rib (2%). 13 patients had 1 bone island, 8 patients had 2, 9 cases had 3 and 11 cases had more than 3 enostoses. Overall, 114 UOM were evaluated, their average density was 728 ± 163 HU (observer1) and 712 ± 178 HU (observer2). The area under the curve value of mean density to distinguish enostoses from UOM was 0,982. Using a cut-off of 881 HU for mean density, sensitivity was 98% and specificity 95%. Conclusion: The frequency of enostosis in this study is 89%. The average density identified can help to distinguish enostoses from UOM. Advances in knowledge: We report the exact frequency of enostosis.

Adrenocortical tumours: high CT attenuation value correlates with eosinophilia but does not discriminate lipid-poor adenomas from malignancy

2013 ◽  
Vol 66 (12) ◽  
pp. 1076-1080 ◽  
Author(s):  
Mirkka Pennanen ◽  
Merja Raade ◽  
Johanna Louhimo ◽  
Timo Sane ◽  
Ilkka Heiskanen ◽  
...  
Keyword(s):  
Imaging Modality ◽  
Clinical Problem ◽  
Histopathological Diagnosis ◽  
Unenhanced Ct ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Adrenocortical Tumours ◽  
Important Clinical Problem ◽  
Preoperative Ct ◽  
Ct Attenuation Value

BackgroundCharacterisation of adrenal tumours is an important clinical problem. Unenhanced CT is the primary imaging modality to assess the nature of these lesions.AimsTo study the correlation between unenhanced CT attenuation value and the specific histopathology, as well as the proportion of lipid-poor eosinophilic cells in adrenocortical tumours.MethodsWe studied retrospectively primary adrenocortical tumours that had been operated on at Helsinki University Central Hospital between 2002 and 2008. Of 171 tumours, 79 had appropriate preoperative CT scans and were included in the study. We evaluated the unenhanced CT attenuation values (Hounsfield units, HU) of these tumours and determined their histopathological diagnosis by the Weiss scoring system. We also assessed the proportion of lipid-poor eosinophilic cells for each tumour.ResultsUnenhanced CT attenuation value (HU) in adrenocortical tumours correlated well with the proportion of lipid-poor eosinophilic cells (rs=0.750, p<0.001). HU and Weiss score also had a correlation (rs=0.582, p<0.001).ConclusionsUnenhanced CT attenuation value correlates well with the percentage of lipid-poor eosinophilic cells, but unenhanced CT attenuation value fails to differentiate between benign lipid-poor adenomas and malignant adrenocortical tumours. All adrenocortical tumours with unenhanced CT attenuation value ≤10 HU are histologically benign lipid-rich tumours.

scholarly journals Use of Three-Dimensional Printing in Modelling an Anatomical Structure with a High Computed Tomography Attenuation Value: A Feasibility Study

2021 ◽  
Vol 11 (8) ◽  
pp. 2085-2090
Author(s):  
Lakna N. Kariyawasam ◽  
K. C. Ng Curtise ◽  
Zhonghua Sun ◽  
Catherine S. Kealley
Keyword(s):  
Computed Tomography ◽  
3D Printing ◽  
Cortical Bone ◽  
Three Dimensional ◽  
3D Printer ◽  
Material Extrusion ◽  
Radiological Features ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Ct Attenuation Value

Introduction: Three-dimensional (3D) printing provides an opportunity to develop anthropomorphic computed tomography (CT) phantoms with anatomical and radiological features mimicking a range of patients’ conditions, thus allowing development of individualised, low dose scanning protocols. However, previous studies of 3D printing in CT phantom development could only create anatomical structures using potassium iodide with attenuation values up to 1200 HU which is insufficient to mimic the radiological features of some high attenuation structures such as cortical bone. This study aimed at investigating the feasibility of using 3D printing in modelling cortical bone with a non-iodinated material. Methods: This study had 2 stages. Stage 1 involved a vat photopolymeri-sation 3D printer to directly print cube phantoms with different percentage compositions of calcium phosphate (CP) and resin (approach 1), and approach 2 using a material extrusion 3D printer to develop a cube mould for infilling of the CP with hardener as the phantom. The approach able to create the cube phantom with the CT attenuation value close to that of a tibial mid-diaphysis cortex of a real patient, 1475±205 HU was employed to develop a tibial mid-diaphysis phantom. The mean CT numbers of the cube and tibia phantoms were measured and compared with that of the original CT dataset through unpaired f-test. Results: All phantoms were scanned by CT using a lower extremity scanning protocol. The moulding approach was selected to develop the tibia mid-diaphysis phantom with CT attenuation value, 1434±184 HU which was not statistically significantly different from the one of the original dataset (p = 0.721). Conclusion: This study demonstrates the feasibility to use the material extrusion 3D printer to create a tibial mid-diaphysis mould for infilling of the CP as an anthropomorphic CT phantom and the attenuation value of its cortex matches the real patient’s one.

Use of dynamic CT attenuation value for diagnosis of acute gangrenous cholecystitis

2016 ◽  
Vol 34 (12) ◽  
pp. 2306-2309 ◽  
Author(s):  
Hiromitsu Maehira ◽  
Aya Itoh ◽  
Masayasu Kawasaki ◽  
Masao Ogawa ◽  
Atsuo Imagawa ◽  
...  
Keyword(s):  
Dynamic Ct ◽  
Gangrenous Cholecystitis ◽  
Attenuation Value ◽  
Ct Attenuation ◽  
Ct Attenuation Value
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