Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Yamada, Yoshitake; Yamada, Minoru; Yokoyama, Yoichi; Tanabe, Akiko; Matsuoka, Satoshi; Niijima, Yuki; Narita, Kentaro; Nakahara, Takehiro; Murata, Mitsuru; Fukunaga, Koichi; Chubachi, Shotaro; Jinzaki, Masahiro

doi:10.1159/000507265

Cited by 53 publications

(72 citation statements)

References 25 publications

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“…Upright CT (prototype TSX-401R, Canon Medical Systems, Japan) was developed based on 320-detector row CT (Aquilion ONE, Canon Medical Systems, Japan). Upright CT also has 320-detector rows, and its performance is comparable to that of conventional supine CT as described previously 9,10 . Thus, both conventional CT and upright CT machines enable continuous or intermittent (repeated) axial scans covering 16 cm per rotation at the same position using 320 detector rows (4D-scan) and helical scans using 80 detector rows.…”

Section: Methodsmentioning

confidence: 80%

“…The recent improvement in CT has resulted in shorter scanning times, and the latest 320-row detector CT scanner can image the whole head within 5 s using helical mode and obtain 3-dimensional images of the whole head over time (4-dimensional imaging) using a 16-cm coverage axial scan. Recently, in collaboration with Toshiba Medical Systems (currently Canon Medical Systems), we proposed and developed an upright 320-detector row CT scanner; this scanner can obtain images of subjects in a standing or sitting position 9,10 . Using this system, we found that gravity differentially affected the volume and shape of the vena cava within the torso depending on body position 10 .…”

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confidence: 99%

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Posture-induced changes in the vessels of the head and neck: evaluation using conventional supine CT and upright CT

Kosugi

Yamada

et al. 2020

Sci Rep

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Since the venous system is affected by gravity, upright computed tomography (CT) in addition to conventional supine CT has great potential for evaluating postural changes in the venous system. We evaluated the morphological differences in the head and neck vessels by performing a contrast CT study in both the supine and the sitting positions. In this study, the 20 included participants (10 men and 10 women) were healthy adults aged 30 to 55 years. The cross-sectional area of the cervical vessels, craniocervical junction veins, and intracranial vessels were obtained quantitatively. Venous sinuses and venous plexuses that were difficult to measure were evaluated qualitatively. The average change in areas from a supine to an upright posture was − 77.87 ± 15.99% (P < 0.0001) in the right internal jugular vein (IJV), − 69.42 ± 23.15% (P < 0.0001) in the left IJV, − 61.52 ± 12.81% (P < 0.0001) in the right external jugular vein (EJV), and − 58.91 ± 17.37% (P < 0.0001) in the left EJV. In contrast, the change in the anterior condylar vein (ACV) from a supine to an upright posture was approximately + 144% (P < 0.005) on the right side and + 110% (P < 0.05) on the left side. In addition, according to the qualitative analysis, the posterior venous structures including the anterior condylar confluence (ACC) of the craniocervical junction became more prominent in an upright posture. Despite these changes, the intracranial vessels showed almost no change between postures. From a supine to an upright position, the IJVs and EJVs above the heart collapsed, and venous channels including the ACCs and ACVs opened, switching the main cerebral venous drainage from the IJVs to the vertebral venous system. Upright head CT angiography can be useful for investigating physiological and pathophysiological hemodynamics of the venous system accompanying postural changes.

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Section: Methodsmentioning

confidence: 80%

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confidence: 99%

Posture-induced changes in the vessels of the head and neck: evaluation using conventional supine CT and upright CT

Kosugi

Yamada

et al. 2020

Sci Rep

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“…This study evaluated the shortest distance between the acromion and humeral head in the standing position by using a newly developed upright CT scanner with a 3D approach. 8,9 Measuring 3D AHD while standing straight was feasible, and the mean value of the 3D AHD of healthy participants without previous injuries was 7.3 mm, ranging from 4.7 mm to 14.0 mm. The AHD was greater in men than in women.…”

Section: Discussionmentioning

confidence: 99%

“…However, a novel upright CT scanner has been developed, which enables 3D whole-torso cross-sectional scanning in the standing position 8 and evaluation of the effect of gravity on the human body. 9 This study aimed to clarify the 3D minimum distance between the acromion and humeral head of normal shoulders in the standing position using an upright CT scanner and compare the AHD values with those obtained using conventional methods. We hypothesized that 3D measurement of the actual distance between the acromion and humeral head in the standing position is feasible using CT scans and that its AHD values differ from those obtained using 2D analysis or in the supine position.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of three-dimensional acromiohumeral distance in the standing position and comparison with its conventional measuring methods

Yoshida

Matsumura²,

Yamada

et al. 2020

Preprint

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Background: Narrowing of the acromiohumeral distance (AHD) implies a rotator cuff tear. However, conventional AHD measurements using two-dimensional (2D) imaging or with the patient in the supine position might differ from that while standing during daily activity. This study aimed to evaluate the three-dimensional (3D) actual distance between the acromion and humeral head in the standing position and compare the AHD values with those obtained using conventional measuring methods.Methods: Computed tomography (CT) images of 166 shoulders from 83 healthy volunteers (31 male and 52 female; mean age 40.1 ± 5.8 years; age range, 30–49 years) were prospectively acquired in the supine and standing positions using conventional and upright CT scanners, respectively. The minimum distance between the acromion and humeral head on the 3D surface models was considered as the 3D AHD. We measured the 2D AHD on anteroposterior digitally reconstructed radiographs. The AHD values were compared between the supine and standing positions and between the 2D and 3D measurements.Results: The mean values of 2D AHD were 8.8 ± 1.3 mm (range, 5.9–15.4 mm) in the standing position and 8.1 ± 1.2 mm (range, 5.3–14.3 mm) in the supine position. The mean values of 3D AHD were 7.3 ± 1.4 mm (range, 4.7–14.0 mm) in the standing position and 6.6 ± 1.2 mm (range, 4.4–13.7 mm) in the supine position. The values of 3D AHD were significantly lower than those of 2D AHDs in both the standing and supine positions (P < 0.001). The values of 2D and 3D AHDs were significantly lower in the supine position than in the standing position (P < 0.001). Conclusions: This study evaluated the 3D AHD of normal shoulders in the standing position using an upright CT scanner. The present results indicated that assessments in the supine position can underestimate the value of the AHD compared with those made in the standing position and that assessments using 2D analysis can overestimate the value.

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“…A newly developed upright CT scanner, whose transverse 320 row-detector gantry includes a stand supporting the rotary section on either side with a linear motion rail and ball screw to move the scanner up and down, enables whole-torso cross-sectional scanning with a 3dimensional acquisition in the standing position [7] and evaluation of the effect of gravity on the human body [8]. The purpose of this study was to evaluate the 3dimensional alignment of the shoulder girdle in the supine position using a conventional CT scanner and in the standing position using a newly developed upright CT scanner and to assess the alignment changes of the girdle between these two positions.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional alignment changes of the shoulder girdle between the supine and standing positions

et al. 2020

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Background Although humans spend most of their day in a standing or sitting position, it is difficult to accurately evaluate the alignment of the shoulder girdle during daily activity, and its alignment changes between positions. The purpose of this study was to evaluate the 3-dimensional alignment of the shoulder girdle in the supine and standing positions by computed tomography (CT) and to assess the alignment changes of the shoulder girdle between these two positions. Methods CT scans of both shoulders of 100 healthy volunteers were prospectively taken in both supine and standing positions on the same day. The local 3-dimensional coordinate systems of the thorax, clavicle, and scapula were defined from the specific bony landmarks, and 3-dimensional angular rotations and positions of the clavicle and scapula were calculated. Differences in rotations and positions of the clavicle and scapula were evaluated between the supine and standing positions. Results Compared with the supine position, the clavicle showed significantly less elevation and greater retraction, and the scapula showed significantly less upward rotation, anterior tilting, and internal rotation in the standing position. Compared with the supine position, the clavicle center was located more inferiorly, posteriorly, and laterally, and the scapula center was located more inferiorly, posteriorly, and medially in the standing position. Conclusions The present study showed that angular rotations and positions of the clavicle and scapula change significantly with position due to the effect of gravity.

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Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison

Cited by 53 publications

References 25 publications

Posture-induced changes in the vessels of the head and neck: evaluation using conventional supine CT and upright CT

Posture-induced changes in the vessels of the head and neck: evaluation using conventional supine CT and upright CT

Evaluation of three-dimensional acromiohumeral distance in the standing position and comparison with its conventional measuring methods

Three-dimensional alignment changes of the shoulder girdle between the supine and standing positions

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