Ectopic thyroids have lower computed tomography attenuation values than orthotopic thyroids

Endocrine ◽  
2018 ◽  
Vol 62 (3) ◽  
pp. 546-551
Author(s):  
Ting Gu ◽  
Ying-li Lu ◽  
Bing Han ◽  
Bo-Ren Jiang ◽  
Li-Zhen Wang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Attenuation Values

scholarly journals Application of Computed Tomography (CT) Attenuation Values in Diagnosis of Transudate and Exudate in Patients with Pleural Effusion

2018 ◽  
Vol 11 (02) ◽  
pp. 19-25
Author(s):  
Keshab Sharma ◽  
PS Lamichhane ◽  
BK Sharma
Keyword(s):  
Computed Tomography ◽  
Pleural Effusion ◽  
Ct Scan ◽  
Pleural Fluid ◽  
Pleural Effusions ◽  
Hounsfield Units ◽  
Fluid Analysis ◽  
Ct Attenuation ◽  
The Mean ◽  
Attenuation Values

Background: Pleural effusion is the pathologic accumulation of fluid in the pleural space. The fluid analysis yields important diagnostic information, and in certain cases, fluid analysis alone is enough for diagnosis. Analysis of pleural fluid by thoracentesis with imaging guidance helps to determine the cause of pleural effusion. The purpose of this study was to assess the accuracy of computed tomography (CT) in characterizing pleural fluid based on attenuation values and CT appearance. Materials and Methods: This prospective study included 100 patients admitted to Gandaki Medical College and Teaching Hospital, Pokhara, Nepal between January 1, 2017 and February 28, 2018. Patients who were diagnosed with pleural effusion and had a chest CT followed by diagnostic thoracentesis within 48 hours were included in the study. Effusions were classified as exudates or transudates using laboratory biochemistry markers on the basis of Light’s criteria. The mean attenuation values of the pleural effusions were measured in Hounsfield units in all patients using a region of interest with the greatest quantity of fluid. Each CT scan was also reviewed for the presence of additional pleural features. Results: According to Light’s criteria, 26 of 100 patients with pleural effusions had transudates, and the remaining patients had exudates. The mean attenuation of the exudates (16.5 ±1.7 HU; 95% CI, range, -33.4 – 44 HU) was significantly higher than the mean attenuation of the transudates (11.6 ±0.57 HU; 95% CI, range, 5 - 16 HU), (P = 0.0001). None of the additional CT features accurately differentiated exudates from transudates (P = 0.70). Fluid loculation was found in 35.13% of exudates and in 19.23% of transudates. Pleural thickening was found in 29.7% of exudates and in 15.3% of transudates. Pleural nodule was found in 10.8% of exudates which all were related to the malignancy. Conclusion: CT attenuation values may be useful in differentiating exudates from transudates. Exudates had significantly higher Hounsfield units in CT scan. Additional signs, such as fluid loculation, pleural thickness, and pleural nodules were more commonly found in patients with exudative effusions and could be considered and may provide further information for the differentiation.

Attenuation Values in Computed Tomography of the Abdomen

Radiology ◽  
1977 ◽  
Vol 125 (1) ◽  
pp. 135-140 ◽  
Author(s):  
Victor C. Mategrano ◽  
Jerry Petasnick ◽  
John Clark ◽  
Anthony Chung Bin ◽  
Ronald Weinstein
Keyword(s):  
Computed Tomography ◽  
Attenuation Values

scholarly journals Quantitative High-resolution Computed tomography Analysis of Antisynthetase Syndrome with Interstitial Pneumonia

2021 ◽  
Author(s):  
Xueren Li ◽  
Shouchun Peng ◽  
Qi Wu ◽  
Huarui Zhang ◽  
Na Feng ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Resolution ◽  
Interstitial Pneumonia ◽  
Reference Value ◽  
Hounsfield Unit ◽  
Antisynthetase Syndrome ◽  
High Resolution Computed Tomography ◽  
Volume Weight ◽  
Hrct Patterns ◽  
Attenuation Values

Abstract Background Non-specific interstitial pneumonia (NSIP) combined with organizing pneumonia (OP) pattern has been confirmed in pathology or radiology. This study is to analyze the correlation between high-resolution computed tomography (HRCT) quantitative indexes (QI) and pulmonary function test parameters (PFTs), and compare differences of HRCT patterns in Antisynthetase Syndrome with interstitial pneumonia (ASS-IP).Methods Data of ASS-IP patients admitted to respiratory department of Ping Jin hospital from January 2014 to December 2019 were retrospectively reviewed.Results 21 ASS-IP patients were enrolled in this study and 3 patients were NSIP, 9 patients were OP and 8 patients were NSIP overlap OP (NSIP/OP) pattern. (1) Volume, Weight percentages of the extracted whole lung volume with attenuation values (V%, W %) and mean lung attenuation (MLA) of non-aerated area is 5.69%, 16.43% and -11.76 Hounsfield unit (Hu). Total MLA of attenuation values(MLAtotal) is -678.97 Hu.(2)FVC and MLA of poorly aerated（r=0.58,P=0.048）, FEV1 and MLA（r=0.79,P=0.001）of poorly aerated, FEV1/FVC（r=0.23,P=0.01） and MLA of normally lung aerated, have linear correlation .(3) DLCO (P=0.049), volume of poorly aerated (Vfibrosis%,P =0.03), and weight of hyper inflated (Whyper%,P=0.02) percentages, and MLAtotal (P=0.01) have significant statistic differences between patients with NSIP/OP or OP patterns, but the therapy improvement time(P=0.41) had no difference. Conclusions QI of HRCT has a good correlation with PFTs and partly reference value to pathological classification of ASS-IP. NSIP/OP may be a common pattern in ASS-IP, fibrosis severity of which is more severe than OP.

Computed Tomography of Lipomatous and Myxoid Tumors

1985 ◽  
Vol 26 (6) ◽  
pp. 709-713 ◽  
Author(s):  
S. Lindahl ◽  
G. Markhede ◽  
Ö. Berlin
Keyword(s):  
Computed Tomography ◽  
Contrast Enhancement ◽  
Soft Tissues ◽  
Preoperative Evaluation ◽  
Surrounding Tissue ◽  
Round Cell ◽  
Cell Type ◽  
Radiographic Appearance ◽  
Histologic Types ◽  
Attenuation Values

Thirty-two lipomatous and myxoid tumors were examined by computed tomography (CT). An attempt was made to correlate the radiographic appearance of the tumor to different histologic types of these tumors. It was found that a well delineated lipomatous lesion with uniform radiographic density, an attenuation value below −73 Hounsfield units (HU) and absence of contrast enhancement can be considered strongly suggestive of a benign lipoma. Atypical lipomas, myxoma and well differentiated liposarcomas have good delineation against the surrounding tissue with no peripheral hypervascularity in the majority of cases. The attenuation values varied between −83 and +38 HU. Liposarcomas of myxoid type, mixed myxoid and round-cell type, round-cell type, and pleomorphic type were all poorly delineated with attenuation values between +12 and +38 HU and with varying contrast enhancement. Thus CT can be considered to play an important role in the preoperative evaluation of lipomatous and myxoid tumors of the soft tissues. Besides valuable topographic information CT helps, to some extent, to differentiate between various types of lipomatous tumors.

Lingual dermoid cyst with congenital discharging sinus: a rare entity

2012 ◽  
Vol 127 (2) ◽  
pp. 211-214 ◽  
Author(s):  
Z Sun ◽  
L Sun ◽  
Y Gao ◽  
X Ma
Keyword(s):  
Computed Tomography ◽  
English Language ◽  
Fatty Tissue ◽  
Rare Entity ◽  
Hounsfield Units ◽  
Radiological Features ◽  
Computed Tomography Images ◽  
Attenuation Values ◽  
Congenital Fistula ◽  
Language Literature

AbstractObjective:There have been few reports of lingual dermoid cysts with a congenital discharging fistula. We report such a case, which mimicked lipoma on computed tomography, and we discuss relevant clinical and radiological features.Method:We present a case report and a review of the English language literature concerning lingual dermoid cysts either mimicking lipoma or with a congenital discharging sinus.Results:A 35-year-old man presented with a lingual mass associated with a congenital fistula in the midline of the tongue dorsum, which discharged abnormal secretions. Computed tomography images showed that the lesion was well defined and contained homogeneous fatty tissue giving computed tomography attenuation values of −120 Hounsfield units.Conclusion:Lingual dermoid cysts may develop with a midline discharging fistula, and may exhibit radiological similarity to lipomas on computed tomography.

Protocol for measurement of liver fat by computed tomography

2006 ◽  
Vol 100 (3) ◽  
pp. 864-868 ◽  
Author(s):  
Lance E. Davidson ◽  
Jennifer L. Kuk ◽  
Timothy S. Church ◽  
Robert Ross
Keyword(s):  
Computed Tomography ◽  
Liver Fat ◽  
Clinical Settings ◽  
Ct Image ◽  
Hounsfield Units ◽  
Spleen Tissue ◽  
Routine Measurement ◽  
Preliminary Study ◽  
The Difference ◽  
Attenuation Values

To develop a protocol for measurement of liver fat using computed tomography (CT), we conducted a preliminary study with 118 men and 76 women to determine a readily identifiable vertebral landmark at which the CT image displayed both liver and spleen. Analysis of five landmarks revealed that the CT image obtained at the T12–L1 level simultaneously displayed the liver and spleen in 90% of the men and women. The T12–L1 protocol was cross-validated on a sample of 130 men and 113 women. In this sample, we also assessed the regional characteristics of liver and spleen tissue attenuation at the T12–L1 level by subdividing each image into quartiles from anterior to posterior, each of which were further divided into medial and lateral regions. A similar analysis was performed on images located 12 mm above and below T12–L1. The T12–L1 image displayed both liver and spleen in 92% (403 of 437) of the combined study sample. There was a significant ( P < 0.005) stepwise increase in attenuation values [Hounsfield units (HU)] from the inferior to superior image. Although some significant ( P < 0.05) differences were observed between the eight regions by comparison to the whole liver or spleen, the average magnitude of the difference was <2.0 HU for liver and <3.5 HU for spleen. Acquisition of a single CT image at the T12–L1 level is a practical and reliable method for routine measurement of liver fat in research and clinical settings.

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