The impact of 3D reconstruction technology on liver surgery in changing the pathway of surgical maneuvers: A case report.

INTRODUCTION: This case report illustrates the significant role that 3D technology can play in major hepatic surgery, aiding in the determination of the optimal surgical approach. CASE PRESENTATION: We present the case of a patient with metachronous liver metastasis from rectal cancer involving segments 6 and 7, extending to retroperitoneal structures such as the inferior vena cava (IVC) and the right renal vein (RRV). DISCUSSION: After confirming the feasibility of a right hepatectomy, we opted for a traditional posterior approach, avoiding the hanging maneuver. The 3D rendering was instrumental in this decision, revealing that the mass was in close proximity to the IVC at the 11 o'clock position, a critical area for surgical instruments during the hanging maneuver. CONCLUSION: When 2D imaging fails to provide sufficient information, 3D rendering can substantially aid the decision-making process.

Infectious complications of extra-peritoneal pelvic packing in emergency room.

PURPOSE: The Extra-Peritoneal Pelvic Packing (EPP) is a procedure used in emergency conditions to control pelvic hemorrhage. This procedure can be performed in Emergency Room (ER) if the patient is too unstable to be transported into the operating room (OR), with a possible increased risk of infections linked to a less sterile environment. METHODS: All patients who underwent EPP from 2009 to 2018 were selected from the trauma registry. The patients were divided into two groups according to where EPP was performed (ER or OR). A Propensity Score Matching was realized. EPP was removed in all patients in the OR after obtaining hemodynamic stabilization within 24-48 h and surgical pads were sent to the laboratory for microbiological analysis. RESULTS: Eighty-four patients underwent EPP during the period of the study. After PSM, 26 couples of patients were selected. No differences were observed between the two groups in the development of pelvic infection. Patients managed in OR showed a higher rate of associated abdominal injuries (p = 0.027) and an increasing need for external fixation (p = 0,005) as well as an increased proportion of laparotomies (p = 0.023), orthopedic interventions (p = 0.005) and a higher systolic blood pressure on admission (p = 0.003). CONCLUSIONS: The EPP is a safe procedure, even when performed out of OR. The EPP in ER allows an earlier control of bleeding in patients in extremis. To minimize the risk of infection, EPP should be removed early, as soon as hemodynamics have been stabilized.

Parallel fractional correlation: an optical implementation.

An optical setup to obtain all the fractional correlations of a one-dimensional input in a single display is implemented. The system works as a multichannel parallel correlator for a continuous set of fractional orders and presents a variable shift variance. Some experimental results together with computer simulations are performed to illustrate the performance of our proposal.

Optical correlation based on the fractional Fourier transform.

Some properties of optical correlation based on the fractional Fourier transform are analyzed. For a particular set of fractional orders, a filter is obtained that becomes insensitive to scale variations of the object. An optical configuration is also proposed to carry out the fractional correlation in a flexible way, and some experimental results are shown.

Radon-Wigner display: a compact optical implementation with a single varifocal lens.

A new optical implementation of the Radon-Wigner display for one-dimensional objects is presented, making use of the fractional Fourier transform approach. The proposed setup makes use of only two conventional refractive elements: a cylindrical lens and a varifocal lens. Although the exact magnifications cannot be achieved simultaneously for all the fractional transforms, an optimum design can be obtained through balancing the conflicting magnification requirements. Experimental results are obtained with a commercially available progressive addition lens. For comparison, computer simulations are also provided.

Space-variant optical correlator based on the fractional Fourier transform: implementation by the use of a photorefractive Bi(12)GeO(2(a)) (BGO) holographic filter.

A space-variant optical correlator is proposed on the basis of the fractional Fourier transform. The optical device uses as a recording medium for the holographic filter a photorefractive Bi(12)GeO(2) (BGO) crystal. The experimental results confirm the shift-variance properties. Some limitations that arise from the volume diffraction are also considered.