scholarly journals Comparison of the Hounsfield Unit in CT scan with the Gray Level in cone-beam CT

2019 ◽  
Vol 13 (3) ◽  
pp. 177-182 ◽  
Author(s):  
Tahmineh Razi ◽  
Parya Emamverdizadeh ◽  
Nadia Nilavar ◽  
Sedigheh Razi
Keyword(s):  
Soft Tissues ◽  
Low Cost ◽  
Cone Beam Ct ◽  
Hounsfield Unit ◽  
Cone Beam ◽  
Gray Level ◽  
Hard Tissues ◽  
Short Time ◽  
High Degree ◽  
Implant Treatment

Background. The present study was undertaken to compare the Hounsfield Unit (HU) in computed tomography (CT) with the gray level in CBCT in human tissues. Methods. In this study, 25 different soft and hard tissues were evaluated in 21 patients. CBCT images were taken with Newtom VGi machine (Verona, Italy) and CT images were prepared with Somatom Sensation unit (Siemens, Germany). The HU values of soft and hard tissues were compared with the gray level values of CBCT images. Results. There was a strong correlation between the HU in CT and the gray level in CBCT in soft tissues (P<0.001, R2=0.85) and hard tissues (P<0.001, R2=0.74) and in general (P<0.001, R2=0.91). Conclusion. A high degree of agreement was seen between HU in CT and gray level in CBCT in both hard and soft tissues. Since the gray level in CBCT was similar to HU in CT and can be used as a parameter determine bone density in implant treatment and also to determine the bone type, the CBCT technique is recommended in such cases due to its low radiation dose, short time and low cost compared to CT.

scholarly journals Cone-Beam Three-Dimensional Dental Volumetric Tomography in Dental Practice

2017 ◽  
Vol 7 (3) ◽  
pp. 62 ◽  
Author(s):  
Suzan Cangul ◽  
Ozkan Adiguzel
Keyword(s):  
Soft Tissues ◽  
Low Cost ◽  
Three Dimensional ◽  
Cone Beam ◽  
Imaging Method ◽  
Dental Practice ◽  
3 Dimensional ◽  
Scanning Time ◽  
Technological Advances ◽  
Native Speakers Of English

Imaging methods are of great importance for diagnosis and treatment in dentistry. With technological advances, great progress has been made in these methods. Over time, 3-dimensional (3-D) imaging has replaced 2-dimensional, thereby providing examination of objects in all directions. Of these methods, which play an important role in the clinical evaluation of patients, cone-beam computed tomography (CBCT) is the newest and most advanced imaging method. This method will revolutionize dental in comparison with conventional CT, it has several advantages, including a shorter scanning time, low radiation dose, low cost and the acquisition of high-resolution images. With 3-D imaging technology, this method has introduced the possibility of applying several procedures from diagnosis in the maxillofacial region to operative and surgical procedures. Although very clear results are not obtained from the imaging of soft tissues, the most important advantage of this technology is the capability of imaging hard and soft tissues together.   How to cite this article: Cangul S, Adiguzel O. Cone-Beam Three-Dimensional Dental Volumetric Tomography in Dental Practice. Int Dent Res 2017;7:62-70.  Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Hounsfield unit recovery in clinical cone beam CT images of the thorax acquired for image guided radiation therapy

2016 ◽  
Vol 61 (15) ◽  
pp. 5781-5802 ◽  
Author(s):  
Rune Slot Thing ◽  
Uffe Bernchou ◽  
Ernesto Mainegra-Hing ◽  
Olfred Hansen ◽  
Carsten Brink
Keyword(s):  
Radiation Therapy ◽  
Cone Beam Ct ◽  
Hounsfield Unit ◽  
Ct Images ◽  
Cone Beam ◽  
Image Guided Radiation Therapy ◽  
Image Guided

scholarly journals Accuracy of Cone Beam CT Measurements for Assessment of Posterior Mandible: A Cadaver Study

2021 ◽  
Author(s):  
Izzati Nabilah Ismail ◽  
Mohammad Aizuddin Abu Bakar ◽  
Khairul Fikri Hairul Anuar ◽  
Mohamad Arif Ramlee
Keyword(s):  
Soft Tissues ◽  
Cone Beam Ct ◽  
Cadaver Study ◽  
Cone Beam ◽  
Occlusal Plane ◽  
Good Tool ◽  
Sigmoid Notch ◽  
Physical Measurements ◽  
Ct Measurements ◽  
Inferior Border

Objectives: This study is aimed at analysing the accuracy and reliability of the cone beam CT (CBCT) measurements and direct physical measurements of the posterior mandible. Materials and methods: Eighteen cadaveric hemi-mandibles were dissected from the soft tissues and the CBCT images of the mandibles were taken. Direct physical and cone beam CT measurements of six landmarks which includes height of ramus (R), distance of lingula to sigmoid notch (LS), distance of lingula to inferior border (LI), position of lingula in relation to occlusal plane (L-OP),  ramus thickness at crestal level (RT-C), and ramus thickness at midway between sigmoid notch and lingula (RT-M) were determined. Accuracy and reliability of the measurements were tested. Results: Four landmarks showed high accuracy when measuring the posterior mandible, while two landmarks, LI and RT-M, showed statistically significant weaker accuracy (p<0.05). Inter-reliability were good for all landmarks when measured directly physically on mandibles (ICC>0.7 and p>0.05), but were low on two landmarks, LI and RT-C, on CBCT measurement (ICC<0.5 and p<0.05). Conclusion: A generally strong accuracy between direct physical and CBCT measurements for most landmarks on posterior mandible were found. Reliability between two researchers were high on direct physical measurements. Meanwhile, two landmarks on CBCT which include LI and RT-C showed low inter-reliability. Hence, CBCT measurements proved to be a good tool for pre-operative assessment, since high inter-reliability and strong accuracy corresponding to direct physical were recorded.

SU-FF-J-124: The Hounsfield Unit (HU) Accuracy in Varian's Cone-Beam CT (CBCT) and Its Effect On Dosimetric Verification

2006 ◽  
Vol 33 (6Part6) ◽  
pp. 2049-2049 ◽  
Author(s):  
H Dong ◽  
R Hammoud ◽  
S Li ◽  
Q Chen ◽  
H Guan
Keyword(s):  
Cone Beam Ct ◽  
Hounsfield Unit ◽  
Cone Beam ◽  
Dosimetric Verification

31 Evaluation of Hounsfield Unit correction method on Cone-Beam CT for dose calculation strategies

2018 ◽  
Vol 56 ◽  
pp. 19
Author(s):  
A. Badey ◽  
V. Bodez ◽  
C. Khamphan ◽  
E. Jaegle ◽  
M.E. Alayrach ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Dose Calculation ◽  
Hounsfield Unit ◽  
Correction Method ◽  
Cone Beam

CONE BEAM CT IN DENTAL IMPLANT PLANNING: HOW CLOSE ARE PATIENT DOSIMETRY RESULTS WITH DATA FROM PHANTOM STUDIES FOUND IN LITERATURE?

2019 ◽  
Author(s):  
S Kottou ◽  
A Zapros ◽  
N Stefanopoulou ◽  
N Krompas ◽  
V Tsapaki
Keyword(s):  
Radiation Exposure ◽  
Low Cost ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Study Patient ◽  
Tube Voltage ◽  
Voxel Size ◽  
Phantom Studies ◽  
Area Product ◽  
Patient Radiation Exposure

Abstract Advantages of Cone Beam Computed Tomography (CBCT) include high-quality 3D imaging and reduced radiation exposure with relatively low cost. In this study, patient radiation exposure in CBCT implant planning dentistry was measured in terms of Kerma Area Product (KAP). Data were obtained from 217 CBCT scans on 168 individuals using a CS9300 Carestream system. Scans were made using 80–90 kVp, 4–5 mA, 8 and 13.3 s exposure time (depending on voxel size) and a fixed field of view (FOV) of 10 × 10 cm2 (medium). Mean KAP was estimated using two voxel sizes 180 × 180 × 180 μm3 and 200 × 200 × 200 μm3 and found to be 399 and 314 mGycm2, respectively. Corresponding KAP values found in literature ranged between 210 and 2140 mGycm2. Mean E was estimated using conversion coefficient factors found in literature, according to FOV size and tube voltage value and found to range between 24 and 161 μSv.

scholarly journals Establishment of national diagnostic reference levels in dental cone beam computed tomography in Switzerland

2020 ◽  
Vol 49 (6) ◽  
pp. 20190468
Author(s):  
Marine Deleu ◽  
Dorothea Dagassan ◽  
Isabelle Berg ◽  
Julie Bize ◽  
Karl Dula ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Product Distribution ◽  
Cone Beam ◽  
Diagnostic Reference Levels ◽  
Wisdom Tooth ◽  
Reference Levels ◽  
Tooth Position ◽  
Single Tooth ◽  
Implant Treatment ◽  
Single Tooth Implant

Objectives: The aim of this study was to establish diagnostic reference levels (DRLs) in the field of dental maxillofacial and ear-nose-throat (ENT) practices using cone beam CT (CBCT) in Switzerland. Methods: A questionnaire was sent to owners of CBCTs in Switzerland; to a total of 612 institutions. The answers were analyzed for each indication, provided that enough data were available. The DRLs were defined as the 75th percentile of air kerma product distribution (PKA). Results: 227 answers were collected (38% of all centers). Third quartile of PKA values were obtained for five dental indications: 662 mGy cm² for wisdom tooth, 683 mGy cm² for single tooth implant treatment, 542 mGy cm² for tooth position anomalies, 569 mGy cm² for pathological dentoalveolar modifications, and 639 mGy cm² for endodontics. The standard field of view (FOV) size of 5 cm in diameter x 5 cm in height was proposed. Conclusions: Large ranges of FOV and PKA were found for a given indication, demonstrating the importance of establishing DRLs as well as FOV recommendations in view of optimizing the present practice. For now, only DRLs for dental and maxillofacial could be defined; because of a lack of ENT data, no DRL values for ENT practices could be derived from this survey.

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