Does the Hounsfield Unit Value Determined by Computed Tomography Predict the Outcome of Percutaneous Nephrolithotomy?

2012 ◽  
Vol 26 (7) ◽  
pp. 792-796 ◽  
Author(s):  
Adnan Gücük ◽  
Uğur Üyetürk ◽  
Ufuk Öztürk ◽  
Eray Kemahli ◽  
Mevlüt Yildiz ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Percutaneous Nephrolithotomy ◽  
Hounsfield Unit ◽  
Unit Value

The hounsfield unit value calculated with the aid of non-contrast computed tomography and its effect on the outcome of percutaneous nephrolithotomy

Urolithiasis ◽  
2015 ◽  
Vol 43 (3) ◽  
pp. 277-281 ◽  
Author(s):  
Alper Gok ◽  
Haci Polat ◽  
Ali Cift ◽  
Mehmet Ozgur Yucel ◽  
Bahri Gok ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Percutaneous Nephrolithotomy ◽  
Hounsfield Unit ◽  
Unit Value

scholarly journals Importance of the Hounsfield Unit Value Measured by Computed Tomography in the Differentiation of Hydronephrosis and Pyonephrosis

Cureus ◽  
2020 ◽  
Author(s):  
Abdullah Erdogan ◽  
Murat Sambel ◽  
Volkan Caglayan ◽  
Sinan Avci
Keyword(s):  
Computed Tomography ◽  
Hounsfield Unit ◽  
Unit Value

Density estimation based on the Hounsfield unit value of cone beam computed tomography imaging of the jawbone system

2018 ◽  
Vol 232 (12) ◽  
pp. 1168-1175 ◽  
Author(s):  
Maya Genisa ◽  
Solehuddin Shuib ◽  
Zainul Ahmad Rajion ◽  
Erry Mochamad Arief ◽  
Maman Hermana
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Tooth Enamel ◽  
Three Dimensional ◽  
Hounsfield Unit ◽  
Cone Beam ◽  
True Density ◽  
Dental Imaging ◽  
Unit Value ◽  
Tomography Data

The aim of this study is to investigate the estimation of density from the Hounsfield unit of cone beam computed tomography data in dental imaging, especially for dental implant application. A jaw phantom with various known densities of anatomical parts (e.g. soft tissue, cortical bone, trabecular bone, tooth enamel, tooth dentin, sinus cavity, spinal cord and spinal disc) has been used to test the accuracy of the Hounsfield unit of cone beam computed tomography in estimating the mechanical density (true density). The Hounsfield unit of cone beam computed tomography data was evaluated via the MIMICS software using both two-dimensional and three-dimensional methods, and the results showed correlation with the true density of the object. In addition, the results revealed that the Hounsfield unit of cone beam computed tomography and bone density had a logarithmic relation, rather than a linear one. To this end, the correlation coefficient of logarithmic correlation (R2 = 0.95) is higher than the linear one (R2 = 0.77).

scholarly journals Intraoperative cone beam computed tomography for detecting residual stones in percutaneous nephrolithotomy: a feasibility study

Urolithiasis ◽  
2021 ◽  
Author(s):  
R. A. Kingma ◽  
M. J. H. Voskamp ◽  
B. H. J. Doornweerd ◽  
I. J. de Jong ◽  
S. Roemeling
Keyword(s):  
Computed Tomography ◽  
Percutaneous Nephrolithotomy ◽  
Cone Beam Computed Tomography ◽  
University Hospital ◽  
Cone Beam ◽  
Cross Sectional ◽  
The Mean ◽  
Residual Stones ◽  
Residual Fragments

AbstractCone beam computed tomography (CBCT) provides multiplanar cross-sectional imaging and three-dimensional reconstructions and can be used intraoperatively in a hybrid operating room. In this study, we investigated the feasibility of using a CBCT-scanner for detecting residual stones during percutaneous nephrolithotomy (PCNL). Intraoperative CBCT-scans were made during PCNL procedures from November 2018 until March 2019 in a university hospital. At the point where the urologist would have otherwise ended the procedure, a CBCT-scan was made to image any residual fragments that could not be detected by either nephroscopy or conventional C-arm fluoroscopy. Residual fragments that were visualized on the CBCT-scan were attempted to be extracted additionally. To evaluate the effect of this additional extraction, each CBCT-scan was compared with a regular follow-up CT-scan that was made 4 weeks postoperatively. A total of 19 procedures were analyzed in this study. The mean duration of performing the CBCT-scan, including preparation and interpretation, was 8 min. Additional stone extraction, if applicable, had a mean duration of 11 min. The mean effective dose per CBCT-scan was 7.25 mSv. Additional extraction of residual fragments as imaged on the CBCT-scan occurred in nine procedures (47%). Of the follow-up CT-scans, 63% showed a stone-free status as compared to 47% of the intraoperative CBCT-scans. We conclude that the use of CBCT for the detection of residual stones in PCNL is meaningful, safe, and feasible.

Non-contrast Computed Tomography After Percutaneous Nephrolithotomy: Findings and Clinical Significance

Urology ◽  
2012 ◽  
Vol 79 (5) ◽  
pp. 1004-1010 ◽  
Author(s):  
Mario Sofer ◽  
Ido Druckman ◽  
Arye Blachar ◽  
Jacob Ben-Chaim ◽  
Haim Matzkin ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Clinical Significance ◽  
Percutaneous Nephrolithotomy

Heterogeneity between proximal and distal aspects of occlusive thrombi on pretreatment imaging in acute ischemic stroke

2021 ◽  
pp. 197140092110497
Author(s):  
Tetsuya Hashimoto ◽  
Takenobu Kunieda ◽  
Tristan Honda ◽  
Fabien Scalzo ◽  
Latisha K Sharma ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Ischemic Stroke ◽  
Region Of Interest ◽  
Hounsfield Unit ◽  
Distal Segment ◽  
Large Vessel Occlusion ◽  
Anterior Circulation ◽  
Vessel Occlusion ◽  
The Difference

Background The potential heterogeneity in occlusive thrombi caused by in situ propagation by secondary thrombosis after embolic occlusion could obscure the characteristics of original thrombi, preventing the clarification of a specific thrombus signature for the etiology of ischemic stroke. We aimed to investigate the heterogeneity of occlusive thrombi by pretreatment imaging. Methods Among consecutive stroke patients with acute embolic anterior circulation large vessel occlusion treated with thrombectomy, we retrospectively reviewed 104 patients with visible occlusive thrombi on pretreatment non-contrast computed tomography admitted from January 2015 to December 2018. A region of interest was set on the whole thrombus on non-contrast computed tomography under the guidance of computed tomography angiography. The region of interest was divided equally into the proximal and distal segments and the difference in Hounsfield unit densities between the two segments was calculated. Results Hounsfield unit density in the proximal segment was higher than that in the distal segment (mean difference 4.45; p < 0.001), regardless of stroke subtypes. On multivariate analysis, thrombus length was positively correlated (β = 0.25; p < 0.001) and time from last-known-well to imaging was inversely correlated (β = −0.0041; p = 0.002) with the difference in Hounsfield unit densities between the proximal and distal segments. Conclusions The difference in density between the proximal and distal segments increased as thrombi became longer and decreased as thrombi became older after embolic occlusion. This time/length-dependent thrombus heterogeneity between the two segments is suggestive of secondary thrombosis initially occurring on the proximal side of the occlusion.

Accuracy of Quantification of Iodine and Hounsfield Unit Values on Virtual Monochromatic Imaging Using Dual-Energy Computed Tomography

2018 ◽  
Vol 42 (6) ◽  
pp. 965-971 ◽  
Author(s):  
Hayate Washio ◽  
Shingo Ohira ◽  
Tsukasa Karino ◽  
Yuya Nitta ◽  
Masaaki Hayashi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hounsfield Unit ◽  
Dual Energy ◽  
Dual Energy Computed Tomography ◽  
Virtual Monochromatic Imaging ◽  
Monochromatic Imaging

scholarly journals Hounsfield unit value has null effect on thyroid nodules at 18F-FDG PET/CT scans

2018 ◽  
Vol 62 (4) ◽  
pp. 460-465
Author(s):  
Filiz Eksi Haydardedeoglu ◽  
Gulay Simsek Bagir ◽  
Nese Torun ◽  
Emrah Kocer ◽  
Mehmet Reyhan ◽  
...  
Keyword(s):  
Fdg Pet ◽  
Thyroid Nodules ◽  
Hounsfield Unit ◽  
Ct Scans ◽  
Null Effect ◽  
Unit Value ◽  
Pet Ct ◽  
18F Fdg ◽  
Fdg Pet Ct
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