Motion Analysis of the Trapeziometacarpal Joint Using Three-dimensional Computed Tomography

Background: Zancolli theorized that the first metacarpal bone axially rotates on the semispheroidal part of the trapezium, which is controlled by ligaments. This study used three-dimensional computed tomography (3D-CT) to describe the motion of the first metacarpal bone on the trapezium. Methods: 3D-CT images were taken of the left hand of 30 healthy volunteers (mean age [Formula: see text] years, 15 men and 15 women). They were divided into five groups: radial abduction, retroposition, adduction, palmar abduction, and opposition. The range of motion of radial abduction and palmar abduction of the trapeziometacarpal joint was measured from the first metacarpal bone to the second metacarpal bone. The range of motion of pronation was measured following Cheema's method. The main contacts of the joint surface of trapezium and the first metacarpal bone were determined on the 3D-CT images. Results: Pronation of the trapeziometacarpal joint was [Formula: see text] in radial abduction, [Formula: see text] in retroposition, [Formula: see text] in adduction, [Formula: see text] in palmar abduction, and [Formula: see text] in opposition. Radial abduction was [Formula: see text] in radial abduction, [Formula: see text] in retroposition, [Formula: see text] in adduction, [Formula: see text] in palmar abduction, and [Formula: see text] in opposition. Palmar abduction was [Formula: see text] in radial abduction, [Formula: see text] in retroposition, [Formula: see text] in adduction, [Formula: see text] in palmar abduction, and [Formula: see text] in opposition. The contact surfaces of the trapezium and the first metacarpal bone were dorsal and ulnar in radial abduction, radial and ulnar in retroposition, and volar-ulnar and volarradial in opposition, respectively, while they were both central in adduction and both radial in palmar abduction. Conclusions: The range of motion of the trapeziometacarpal joint was 44° for radial abduction/adduction, 48° for palmar abduction/adduction, and 57° for pronation/supination. The varying contact surfaces of the trapezium and the first metacarpal bone enabled a wide range of motion.

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Standardised 3D-CT Lung Volumes for Patients with Idiopathic Pulmonary Fibrosis

10.21203/rs.3.rs-1129054/v1 ◽

2021 ◽

Author(s):

Yuko Tanaka ◽

Yuzo Suzuki ◽

Hirotsugu Hasegawa ◽

Koshi Yokomura ◽

Atsuki Fukada ◽

...

Keyword(s):

Computed Tomography ◽

Idiopathic Pulmonary Fibrosis ◽

Pulmonary Fibrosis ◽

Pulmonary Function Tests ◽

Three Dimensional ◽

Ct Images ◽

3D Ct ◽

Pulmonary Physiology ◽

Lung Physiology ◽

Lower Lung

Abstract Background: The assessment of lung physiology via pulmonary function tests (PFTs) is essential for patients with idiopathic pulmonary fibrosis (IPF). However, PFTs require active participation, which can be challenging for patients with severe respiratory failure, such as during acute exacerbations (AE) of IPF. Recently advances enabled to re-construct of 3-dimensional computed-tomography (3D-CT) images. Methods: This is a retrospective multi-center cohort study. This study established a standardisation method and quantitative analysis of lung volume (LV) based on anthropometry using three-dimensional computed tomography (3D-CT) images. The standardised 3D-CT LV in patients with IPF at diagnosis (n=140) and during AE (cohort1; n=61 and cohort2; n=50) and those of controls (n=53) were measured. Results: The standardised 3D-CT LVs at IPF diagnosis were less than those of control patients, especially in the lower lung lobes. The standardised 3D-CT LVs were correlated with forced vital capacity (FVC) and validated using the modified Gender-Age-Physiology (GAP) index. The standardised 3D-CT LVs at IPF diagnosis were independently associated with prognosis. During AE, PFTs were difficult to perform, 3D-CT analyses revealed reduced lung capacity in both the upper and lower lobes compared to those obtained at diagnosis. Lower standardised 3D-CT LVs during AE were independently associated with worse outcomes in independent two cohorts. Particularly, volume loss in the upper lobe at AE had prognostic values.Conclusion: A novel image quantification method for assessing pulmonary physiology using standardised 3D-CT-derived LVs was developed. This method successfully predicts mortality in patients with IPF and AE of IPF, and may be a useful alternative to PFTs when PFTs cannot be performed.

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Three-Dimensional Reconstruction Algorithm of Computed Tomography Imaging for Surgical Treatment and Rapid Rehabilitation Nursing of Renal Cell Carcinoma

Scientific Programming ◽

10.1155/2021/9948656 ◽

2021 ◽

Vol 2021 ◽

pp. 1-7

Author(s):

Lijun Wang ◽

Haiyan Lin ◽

Hong Zheng ◽

Yuying Jiang

Keyword(s):

Computed Tomography ◽

3D Reconstruction ◽

Renal Cell ◽

Three Dimensional ◽

Life Quality ◽

Reconstruction Algorithm ◽

Nursing Intervention ◽

Ct Images ◽

3D Ct ◽

Self Rating

This study was carried out to explore the promotion role of computed tomography (CT) imaging three-dimensional (3D) reconstruction technology and rapid rehabilitation nursing intervention (RRNI) in the treatment of patients with renal cell cancer (RCC) laparoscopic radical nephrectomy (LRN) in view of the patient’s condition. 98 RCC patients who were admitted to the hospital from July 2019 to July 2020 were selected as the research subjects, and all patients underwent the LRN and the RRIN. Of which, 46 RCC patients were scanned with CT images (regarded as the CT group), and 46 RCC patients were scanned with CT images based on 3D reconstruction algorithms (regarded as the 3D CT group). The clinical efficacy and the life quality, pain degree, and adverse mood changes before and after the RRN were analyzed and compared. The results showed that the surgery time in the 3D CT group and the CT group was 130.2 ± 42.8 minutes and 162.4 ± 38.5 minutes, respectively ( P < 0.05 ). The recurrence rate of RCC in both groups was 0%. The estimated blood loss in the 3D CT group and the CT group was 93.6 ± 35.5 mL and 90.3 ± 40.2 mL, respectively; the complication rate in the 3D CT and CT group was 5% and 12%, respectively; the hospital stay in the 3D CT and CT group was 12.5 ± 4.7 days and 12.1 ± 3.2 days, respectively, which had no statistical significance ( P > 0.05 ). The scores of visual analogue scale (VAS), 36-Item Short-Form Health Survey (SF-36), self-rating depression scale (SDS), and self-rating anxiety scale (SAS) of patients in the two groups were statistically significant ( P < 0.05 ). It indicated that CT images based on the 3D reconstruction algorithm could be applied in LRN of RCC patients to shorten the surgery time and improve the surgical effect, and implementation of the RRN could relieve the adverse mood of RCC patients and effectively improve their life quality.

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Comparison between Three-Dimensional and Triplanar Computed Tomography Imaging of the Frontal Recess

American Journal of Rhinology and Allergy ◽

10.2500/ajra.2009.23.3350 ◽

2009 ◽

Vol 23 (5) ◽

pp. 502-505 ◽

Cited By ~ 7

Author(s):

Seth J. Isaacs ◽

Parul Goyal

Keyword(s):

Computed Tomography ◽

Frontal Sinus ◽

Three Dimensional ◽

Surgical Techniques ◽

Ct Images ◽

Outflow Tract ◽

Sinus Surgery ◽

3D Ct ◽

Sinus Disease ◽

Frontal Recess

Background Despite advances in endoscopic surgical techniques, management of frontal sinus disease remains challenging. Much of this is related to the complex nature of frontal recess anatomy. A thorough understanding of frontal recess anatomy is paramount for the safety and success of frontal sinus surgery. Three-dimensional (3D) computed tomography (CT) may allow surgeons to obtain a more complete preoperative assessment of frontal recess anatomy. The purpose of this study was to determine if reconstructed 3D CT images as an adjunct to conventional triplanar imaging provide additional information regarding the frontal recess anatomy. Methods A prospective study was performed. Two otolaryngologists reviewed the CT scans of 25 patients referred for routine paranasal sinus disease. The findings from review of the triplanar CT images were compared with the findings from review of the 3D reconstructions. Each study was assessed for (1) frontoethmoidal cells, (2) agger nasi cell, (3) subrabullar and frontal bullar cells, (4) intersinus septal cell, (5) superior uncinate process attachment site, and (6) and frontal sinus outflow tract. The examiners rated the usefulness of each study to identify each of the aforementioned anatomic subsites using a modified 5-point Likert scale. Results Intersinus septal cells, supraorbital ethmoid cells, and the anterior–posterior dimension of the frontal sinus outflow tract were better defined on the reconstructed 3D CT images. Conclusion Three-dimensional CT is a useful adjunct to the conventional triplanar studies for the evaluation of frontal sinus and recess anatomy. This technique can define certain anatomic variants more effectively than 2D multiplanar reconstructed images.

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Visualization of torn anterior cruciate ligament using 3-dimensional computed tomography

Orthopedic Reviews ◽

10.4081/or.2013.e22 ◽

2013 ◽

Vol 5 (3) ◽

pp. 22 ◽

Cited By ~ 1

Author(s):

Hiroaki Uozumi ◽

Toshimi Aizawa ◽

Takehiko Sugita ◽

Tomonori Kunii ◽

Shun Abe ◽

...

Keyword(s):

Computed Tomography ◽

Anterior Cruciate Ligament ◽

Acl Reconstruction ◽

Cruciate Ligament ◽

Three Dimensional ◽

Lateral Wall ◽

Ct Images ◽

Reconstruction Technique ◽

3D Ct ◽

Anterior Cruciate

Recently, a remnant-preserving anterior cruciate ligament (ACL) reconstruction technique has been developed. However, the pre-operative condition of remnant ACL is occasionally difficult to evaluate by magnetic resonance imaging. The purpose of this study is to evaluate the accuracy of pre-operative visualization of remnant ACL using three-dimensional computed tomography (3D-CT). The remnant ACL in 25 patients was examined by 3D-CT before ACL reconstruction surgery. Findings on 3D-CT images and arthroscopy were compared. The 3D-CT images were classified into 4 groups: Group A, remnant fibers attached to the posterior cruciate ligament (PCL); Group B, those located between the PCL and the lateral wall; Group C, those attached to the lateral wall; and Group D, no identifiable remnant fibers on the tibial side. These groups were made up of 4, 3, 9 and 9 patients, respectively. Findings on 3D-CT images were identical to those during arthroscopy in 20 of 25 cases (80%). Remnant ACL can be accurately evaluated using 3D-CT in 80% of cases of torn ACL. This novel method is a useful technique for pre-operative assessment of remnant ACL.

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Lobectomy for lung cancer with a displaced left B1 + 2 and an anomalous pulmonary vein: a case report

Journal of Cardiothoracic Surgery ◽

10.1186/s13019-021-01392-3 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Shinichi Sakamoto ◽

Hiromitsu Takizawa ◽

Naoya Kawakita ◽

Akira Tangoku

Keyword(s):

Computed Tomography ◽

Lung Cancer ◽

Pulmonary Vein ◽

Three Dimensional ◽

Lower Lobe ◽

Rare Condition ◽

3D Ct ◽

Anatomical Structures ◽

Case Presentation ◽

Anomalous Pulmonary Vein

Abstract Background A displaced left B1 + 2 accompanied by an anomalous pulmonary vein is a rare condition involving complex structures. There is a risk of unexpected injuries to bronchi and blood vessels when patients with such anomalies undergo surgery for lung cancer. Case presentation A 59-year-old male with suspected lung cancer in the left lower lobe was scheduled to undergo surgery. Chest computed tomography revealed a displaced B1 + 2 and hyperlobulation between S1 + 2 and S3, while the interlobar fissure between S1 + 2 and S6 was completely fused. Three-dimensional computed tomography (3D-CT) revealed an anomalous V1 + 2 joining the left inferior pulmonary vein and a branch of the V1 + 2 running between S1 + 2 and S6. We performed left lower lobectomy via video-assisted thoracic surgery, while taking care with the abovementioned anatomical structures. The strategy employed in this operation was to preserve V1 + 2 and confirm the locations of B1 + 2 and B6 when dividing the fissure. Conclusion The aim of the surgical procedure performed in this case was to divide the fissure between S1 + 2 and the inferior lobe to reduce the risk of an unexpected bronchial injury. 3D-CT helps surgeons to understand the stereoscopic positional relationships among anatomical structures.

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Prognosis of pulmonary fibrosis presenting with a usual interstitial pneumonia pattern on computed tomography in patients with myeloperoxidase anti-neutrophil cytoplasmic antibody-related nephritis: a retrospective single-center study

BMC Pulmonary Medicine ◽

10.1186/s12890-019-0969-5 ◽

2019 ◽

Vol 19 (1) ◽

Cited By ~ 2

Author(s):

Toshikazu Watanabe ◽

Tomoyuki Minezawa ◽

Midori Hasegawa ◽

Yasuhiro Goto ◽

Takuya Okamura ◽

...

Keyword(s):

Computed Tomography ◽

Pulmonary Fibrosis ◽

Interstitial Pneumonia ◽

Lung Volume ◽

Lung Fibrosis ◽

Usual Interstitial Pneumonia ◽

Three Dimensional ◽

3D Ct ◽

Antifibrotic Therapy ◽

Significant Difference

Abstract Background Myeloperoxidase anti-neutrophil cytoplasmic antibody-related nephritis (MPO-ANCA nephritis) is occasionally accompanied by lung abnormalities such as pulmonary fibrosis. However, the clinical features of pulmonary fibrosis in patients with MPO-ANCA nephritis have not been well documented. This study was performed to compare the prognosis of a usual interstitial pneumonia (UIP) pattern of lung fibrosis in patients with MPO-ANCA nephritis with the prognosis of idiopathic pulmonary fibrosis (IPF). Methods We retrospectively reviewed the medical records of 126 patients with MPO-ANCA nephritis and identified 31 with a UIP pattern of lung fibrosis on high-resolution or thin-slice computed tomography (CT). We compared the characteristics and prognosis of these patients with those of 32 patients with IPF. In 18 patients from both groups, we assessed and compared the decline in lung volume over time using three-dimensional (3D) CT images reconstructed from thin-section CT data. Results The numbers of male and female patients were nearly equal among patients with MPO-ANCA nephritis exhibiting a UIP pattern; in contrast, significant male dominancy was observed among patients with IPF (p = 0.0021). Significantly fewer smokers were present among the patients with MPO-ANCA nephritis with a UIP pattern than among those with IPF (p = 0.0062). There was no significant difference in the median survival time between patients with MPO-ANCA nephritis with a UIP pattern (50.8 months) and IPF (55.8 months; p = 0.65). All patients with IPF in this cohort received antifibrotic therapy (pirfenidone or nintedanib). Almost half of the deaths that occurred in patients with MPO-ANCA nephritis with a UIP pattern were caused by non-respiratory-related events, whereas most deaths in patients with IPF were caused by respiratory failure such as acute exacerbation. In the 3D CT lung volume analyses, the rate of decline in lung volume was equivalent in both groups. Conclusions MPO-ANCA nephritis with a UIP pattern on CT may have an unfavorable prognosis equivalent to that of IPF with a UIP pattern treated with antifibrotic agents.

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Application of 3D Computed Tomography Reconstruction Images to Assess the Thickness and Dimensions of the Posterior Palatal Seal Area

BioMed Research International ◽

10.1155/2019/7912371 ◽

2019 ◽

Vol 2019 ◽

pp. 1-7

Author(s):

Soeun Lim ◽

Seoung-Jin Hong ◽

Joo-Young Ohe ◽

Janghyun Paek

Keyword(s):

Computed Tomography ◽

3D Model ◽

Three Dimensional ◽

Ct Images ◽

Anterior Border ◽

Lateral Direction ◽

Mean Dimension ◽

The Mean ◽

The Right ◽

Palatal Mucosa

Few studies have been reported on the scientific measurements of the thickness and dimensions of the posterior palatal seal (PPS) area. The purpose of this study is to measure and analyze the thickness of palatal mucosa by using a three-dimensional (3D) model reconstructed with computed tomography (CT) images and to present objective values by identifying the PPS area. The CT images were reconstructed as a 3D model by separating the maxillary palate mucosa and teeth. Each reconstructed model was analyzed and the thickness was measured at 93 crossing points of each divided plane. The dimension of the PPS area was measured and the right and left dimensions of the PPS area were compared. The thickness of the palatal mucosa was thicker toward the posterior area. The thickness increased in the lateral direction and decreased again. In the PPS area, the mean dimension between the rearmost of anterior border and the most posterior line was 2.19 mm and the mean dimension between the forefront of anterior border and the most posterior line was 5.19 mm in the right side and 5.16 mm in the left side. The mean dimension from the center of the palate to the right most forward point was 6.85 mm, and the left was 7.36 mm. The new measurement method of palatal mucosal thickness is noninvasive, accurate, and easy to store and study, so it can be used effectively in planning and manufacturing the maxillary complete denture in the digital workflows.

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Three-Dimensional Computed Tomography (3D-CT) was Useful for the Diagnosis of Auditory Ossicular Anomaly and Traumatic Ossicular Dislocation: Three Case Reports

Practica Oto-Rhino-Laryngologica ◽

10.5631/jibirin.105.315 ◽

2012 ◽

Vol 105 (4) ◽

pp. 315-322 ◽

Cited By ~ 1

Author(s):

Akiko Nishida ◽

Rie Kanai ◽

Yoshihiro Tamura ◽

Takuya Tsuji ◽

Fumiko Kuboshima ◽

...

Keyword(s):

Computed Tomography ◽

Case Reports ◽

Three Dimensional ◽

3D Ct

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Fluoroscopy-guided sacroplasty: special focus on preoperative planning from three-dimensional computed tomography

Acta Radiologica ◽

10.1080/02841850802350659 ◽

2008 ◽

Vol 49 (9) ◽

pp. 1042-1048 ◽

Cited By ~ 9

Author(s):

Ø. Gjertsen ◽

T. Schellhorn ◽

P. H. Nakstad

Keyword(s):

Computed Tomography ◽

Pain Relief ◽

Correct Diagnosis ◽

Three Dimensional ◽

The Elderly ◽

Special Focus ◽

3D Ct ◽

Insufficiency Fractures ◽

Multiplanar Reconstructions ◽

Sacral Insufficiency Fractures

Background: Osteoporotic sacral insufficiency fractures are usually spontaneous or caused by discrete traumas. The fluoroscopic anatomy of the sacrum can be difficult to understand, and this is why sacroplasty is considered more challenging than ordinary vertebroplasties. Purpose: To demonstrate the planning of the procedure and the effectiveness of treatment with sacroplasty by means of three-dimensional computed tomography (3D CT) by combining multiplanar reconstructions (MPR) and volume-rendering technique (VRT). Material and Methods: Five elderly, osteoporotic patients with intense pelvic and hip pain underwent weeks of inconclusive clinical and radiological diagnostic efforts. Correct diagnosis was finally attained with magnetic resonance imaging (MRI) and CT. Plain radiographs rarely show fractures, and MR or CT examinations are necessary to demonstrate longitudinal fractures. The procedures were performed with digital biplane equipment using preoperative 3D CT planning procedures. Polymethyl methacrylate (PMMA) was injected to fill the fracture sites. Results: The fractures were successfully treated with sacroplasty using PMMA. A new technique, which involves placing the needles along the long axis of the sacrum, was optimized to the individual patients’ fractures and sacral anatomy by meticulous planning on a workstation with 3D CT data sets. It was technically successful in all five cases. Four of the five patients had sustained pain relief. Conclusion: Sacral insufficiency fractures are not uncommon and should be considered in the elderly population with low back pain. Sacroplasty using the optimized “long-axis technique” gave almost immediate pain relief for all five patients in our study material. No complications were observed.

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Interpretation of mandibular condyle fractures using 2D- and 3D-computed tomography

Brazilian Dental Journal ◽

10.1590/s0103-64402003000300012 ◽

2003 ◽

Vol 14 (3) ◽

pp. 203-208 ◽

Cited By ~ 17

Author(s):

Adriana Paula de Andrade da Costa e Silva ◽

José Leopoldo Ferreira Antunes ◽

Marcelo Gusmão Paraiso Cavalcanti

Keyword(s):

Computed Tomography ◽

Visual Information ◽

Three Dimensional ◽

Mandibular Condyle ◽

Supplementary Information ◽

3D Ct ◽

Bone Fragments ◽

Craniofacial Trauma ◽

Effective Diagnosis ◽

2D And 3D

Computed tomography (CT) has been increasingly used in the examination of patients with craniofacial trauma. This technique is useful in the examination of the temporomandibular joint and allows the diagnosis of fractures of the mandibular condyle. Aiming to verify whether the three-dimensional reconstructed images from CT (3D-CT) produce more effective visual information than the two-dimensional (2D-CT) ones, we evaluated 2D-CT and 3D-CT examinations of 18 patients with mandibular condyle fractures. We observed that 2D-CT and 3D-CT reconstructed images produced similar information for the diagnosis of fractures of the mandibular condyle, although the 3D-CT allowed a better visualization of the position and displacement of bone fragments, as well as the comminution of fractures. These results, together with the possibility of refining and manipulating perspectives in 3D images, reinforce the importance of its use in the surgical planning and evaluation of treatment. We concluded that 3D-CT presented supplementary information for a more effective diagnosis of mandibular condyle fractures.

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