Three‑Dimensional Ultrasonography in Preoperative and Postoperative Volume Assessment of the Undescended Testicle

Terrestrial laser scanning systems are characterized by a sampling pattern which varies in point density across the hemisphere. Additionally, close objects are over-sampled relative to objects that are farther away. These two effects compound to potentially bias the three-dimensional statistics of measured scenes. Previous methods of sampling have resulted in a loss of structural coherence. In this article, a method of sampling is proposed to optimally sample points while preserving the structure of a scene. Points are sampled along a spherical coordinate system, with probabilities modulated by elevation angle and squared distance from the origin. The proposed approach is validated through visual comparison and stem-volume assessment in a challenging mangrove forest in Micronesia. Compared to several well-known sampling techniques, the proposed approach reduces sampling bias and shows strong performance in stem-reconstruction measurement. The proposed sampling method matched or exceeded the stem-volume measurement accuracy across a variety of tested decimation levels. On average it achieved 3.0% higher accuracy at estimating stem volume than the closest competitor. This approach shows promise for improving the evaluation of terrestrial laser-scanning data in complex scenes.

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Three-dimensional binding sites volume assessment during cardiac pacing lead extraction

Clinical Trials and Regulatory Science in Cardiology ◽

10.1016/j.ctrsc.2015.08.006 ◽

2015 ◽

Vol 7 ◽

pp. 1-6

Author(s):

Bich Lien Nguyen ◽

Alessandro Persi ◽

Eli S. Gang ◽

Fabrizio Fattorini ◽

Alessandra Oliva ◽

...

Keyword(s):

Binding Sites ◽

Three Dimensional ◽

Cardiac Pacing ◽

Lead Extraction ◽

Volume Assessment ◽

Pacing Lead

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Lower Blepharoplasty Three-Dimensional Volume Assessment after Fat Pad Transposition and Concomitant Fat Grafting

Facial Plastic Surgery ◽

10.1055/s-0040-1713790 ◽

2020 ◽

Vol 36 (04) ◽

pp. 478-483

Author(s):

Robert T. Cristel ◽

Benjamin P. Caughlin

Keyword(s):

Three Dimensional ◽

Fat Grafting ◽

3D Analysis ◽

Fat Pad ◽

Volume Changes ◽

Autologous Fat Grafting ◽

Autologous Fat ◽

Lower Blepharoplasty ◽

Periorbital Region ◽

Volume Assessment

AbstractLower blepharoplasty is a commonly performed procedure to improve the aesthetic of the lower eyelid and upper midface. Combined fat pad transposition and fat grafting has not been previously studied using three-dimensional (3D) analysis. The aim of the study is to demonstrate the benefits of fat pad transposition with concomitant autologous fat grafting in lower blepharoplasty and to determine quantitative volumetric effects on the tear trough and lower periorbital region using VectraXT 3D imaging and analysis. A retrospective review was performed to identify patients undergoing primary lower blepharoplasty with combined fat pad transposition and fat grafting. The study time period was from September 2017 to March 2019 with a mean 6.5-month postoperative follow-up. This study was performed in a private practice institution (Kovac Cosmetic Center, Oakbrook Terrace, IL). Nine subjects were enrolled in the study with four males and five females. All subjects underwent lower blepharoplasty with combined fat pad transposition and fat grafting without any additional procedures. Preoperative and postoperative photographs were taken with the VectraXT 3D camera system and software. 3D photographs were then compared to assess the volume changes in the periorbital region. The volume in the lower periorbital region was assessed using 3D analysis. All subjects were found to have an increase in volume in the periorbital region. There was a mean volume gain of 2.84 mL on the right and 2.87 mL on the left. There was no statistical difference among volume gains between sides (p = 0.95). Combined fat pad transposition and autologous fat grafting is an effective procedure for improving the tear trough deformity and periorbital area. The use of 3D volume assessment is able to accurately measure and quantify the volume changes of the postoperative results.

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