Density conversion factor determined using a cone-beam computed tomography unit NewTom QR-DVT 9000

Lagravère, MO; Fang, Yuan; Carey, Jason P.; Toogood, RW; Gv, Packota; Major, PW

doi:10.1259/dmfr/55276404

Cited by 81 publications

(43 citation statements)

References 18 publications

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“…The use of reference minifantom object instead of maximum reading value could probably improve direct data comparison and minimize the measuring error. Density conversion factors, introduced in this way, could probably solve this issue for a given CBCT machine [20]. Some further investigations are needed to confirm this possibility.…”

Section: Discussionmentioning

confidence: 94%

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Andruch¹,

Płachta²

2015

Adv Clin Exp Med

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Section: Discussionmentioning

confidence: 94%

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Andruch¹,

Płachta²

2015

Adv Clin Exp Med

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“…Due to the simplicity of this method, and the fact that no better diagnostic methods have been put forward since, this classification remains in wide use. However, the recent spread of CB-CT had led to a rise in the accuracy of bone data for implant placement sites 5,6) . Wakimoto et al examined CT attenuation during artificial filling of jawbones following tooth extraction (socket preservation) and reported the efficacy of HU evaluation during implant placement 7) .…”

Section: Comparison Of Histological Results and Ct Attenuationmentioning

confidence: 99%

Histological Evaluation of Alveolar Bone Ridge for Dental Implant Placement Using a Nondecalcified Frozen Section Technique

Takahashi

Kanou

Ito

et al. 2017

J. Hard Tissue Biology.

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Dental implant therapy has been established as an excellent therapeutic method for the recovery of masticatory function. However, no reports to date have undertaken detailed analyses of jaw bone quality using bone biopsy despite the large impact that jaw bone quality at the implant placement sites has on the prognosis of implant therapy. This study histologically examined jaw bone quality at implant placement sites using nondecalcified frozen sections. We also compared bone quality with attenuation (measured in Hounsfield units (HU)) on computed tomography (CT). Bone quality was highest around the anterior mandibular (67.25%), followed by the anterior maxillary (60.23%), mandibular molars (55.14%) and maxillary molars (44.81%). No statistical correlation with CT attenuation was evident (mean, 540.91 HU). These results suggested that consideration needs to be given to histological diagnosis as well as CT attenuation in clinical evaluations of bone where implant bodies should be placed.

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“…First of all, there is a data acquisition, using some type of X-ray radiation, collecting two-dimensional basic projections of digital images. This is treated as 'raw data' (RD) [11,14,16,17,36,37,[52][53][54][55]58]. In a second step, a computer will analyse the collected two-dimensional basic projections.…”

Section: Basic Principles Of Computed Tomography (Ct)mentioning

confidence: 99%

“…Several names exist for dental Cone Beam Computed Tomography (CBCT) technology in English, like Cone Beam Volumetric Imaging [40] or Digital Volume Tomography [15,58]. In Germany, they used the DVT abbreviation (Dental Volume Tomography or Digital Volume Tomography) rather than the CBCT abbreviation [10][11][12]33,43,61].…”

Section: Basic Principles Of Computed Tomography (Ct)mentioning

confidence: 99%

“…abbreviation is used, the inclusion of computed tomography demands that a radiology specialist must analyse the acquisition, which would represent an additional expenditure. A dentist, oral surgeon, maxillofacial surgeon cannot analyse conventional CT acquisitions [10][11][12]15,17,32,33,35,43,58,[61][62][63][64].There is also a practical reason; DVT is using lower-intensity radiation than conventional CT. Consequently, it makes only the structure of bone density materials visible in details on the acquisition picture but the soft tissue cannot visualized qualitatively [11,37,39,43,65]. In contrast, some cone or pyramidal beam using equipment, scanning with higher intensity X-ray, is able to show the quality of soft tissues (MDCT) [13,14,29,66].…”

mentioning

confidence: 99%

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Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

Plachtovics

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The WARM operation mode represents that the CBCT machine was switched on for at least two hours before the scan but no detector calibration was performed. WARM+C WARM+C scan protocol is consistent with the cone beam computed tomography scan with the complete calibration sequence after the warming-up period. The two-hour warming-up period preceded the calibration process. WUP warming-up period 2D 2 dimensional 3D 3 dimensional iv Galen's principal interest was in human anatomy but, from about 150 BC [2], Roman law had prohibited the dissection of human cadavers. Because of this restriction, Galen performed anatomical dissections on living (vivisection) and dead animals, mostly focusing on pigs and primates [3]. This work was useful because the anatomical structures of these animals usually closely mirror those of humans. Galen clarified the anatomy of the trachea, and was the first to demonstrate that the larynx generates the voice [4,5]. In one experiment, Galen used bellows to inflate the lungs of a dead animal. In his work De motu musculorum, Galen explained the difference between motor and sensory nerves, discussed the concept of muscle tone, and explained the difference between agonists and antagonists [5,6].Andreas Vesalius ( This environment, which lasted from the second century (Galenius) to the sixteenth century (Vesalius), developed a strong desire to have the ability to see inside the human body [7]. Development of medical imagingDuring many centuries the only way to visualize the inside of the human body was through dissection. With technical development, scientists had started to investigate the inside of the human body without its opening. In 1881, Alexander Graham Bell attempted to use magnets and sound waves to discover the location of the bullet that eventually killed U.S.President James A. Garfield [8].After a lengthy period, during scientific experiments with various types of vacuum tube equipment, the discovery of X-rays in 1895, by the Bavarian physicist Conrad Röntgen, represented a major breakthrough (Figure 3 A). When X-rays were finally discovered, they found their way to medical applications within months [9]. B C A 3The original discovery by Röntgen, at the Physical Institute, Julius-Maximilian University, Würzburg, Germany, is recorded to be on 8 November 1895 [9][10][11][12][13][14][15][16][17]. During the discovery, he speculated that a new kind of ray might be responsible for the observation.Since 8 th November was a Friday, instead of relaxing over the weekend, Röntgen took advantage of the time to repeat his experiments. In the following weeks he investigated many properties of the new rays he had temporarily termed 'X-ray'. In fact, he virtually lived in his laboratory during that time. The new X-ray is called the 'Röntgen ray' in many languages [18]. Nearly two weeks after his discovery, he took the very first picture using X-rays of his wife Anna Bertha's hand. When she saw her skeleton she exclaimed 'I have seen my death!' (Figure 3 B and C) [10,18]. Röntgen receive the fir...

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Density conversion factor determined using a cone-beam computed tomography unit NewTom QR-DVT 9000

Abstract: CBCT provides an effective option for determination of material density expressed as Hounsfield Units.

Cited by 81 publications

References 18 publications

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Evaluating Maxilla Bone Quality Through Clinical Investigation of Voxel Grey Scale Values from Cone-Beam Computed Tomography for Dental Use

Histological Evaluation of Alveolar Bone Ridge for Dental Implant Placement Using a Nondecalcified Frozen Section Technique

Examination of Grey Value Accuracy and Improvement of Image Quality in Cone Beam Computed Tomography (CBCT)

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