Broadband anti-reflection coating for the meter class Dark Energy Spectroscopic Instrument lenses

The Dark Energy Spectroscopic Instrument (DESI), currently under construction, will be used to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fiber optic positioners. The fibers, in turn, feed ten broad-band spectrographs. We will describe the broadband AR coating (360 nm to 980nm) that was applied to the lenses of the camera system for DESI using ion assisted deposition techniques in a 3 m coating chamber. The camera has 6 lenses ranging in diameter from 0.8 m to 1.14 m, weighing from 84 kg to 237 kg and made from fused silica or BK7. The size and shape of the surfaces provided challenges in design, uniformity control, handling, tooling and process control. Single surface average transmission and minimum transmission met requirements. The varied optical surfaces and angle of incidence considerations meant the uniformity of the coating was of prime concern. The surface radius of curvature (ROC) for the 12 surfaces ranged from nearly flat to a ROC of 611 mm and a sag of 140 mm. One lens surface has an angle of incidence variation from normal incidence to 40°. Creating a design with a larger than required bandwidth to compensate for the non-uniformity and angle variation created the ability to reduce the required coating uniformity across the lens and a single design to be used for all common substrate surfaces. While a perfectly uniform coating is often the goal it is usually not practicable or cost effective for highly curved surfaces. The coating chamber geometry allowed multiple radial positions of the deposition sources as well as substrate height variability. Using these two variables we were able to avoid using any masking to achieve the uniformity required to meet radial and angle performance goals. Very broadband AR coatings usually have several very thin and optically important layers. The DESI coating design has layers approaching 3 nm in thickness. Having sensitive thin layers in the design meant controlling layer thickness and azimuthal variation were critical to manufacturing repeatability. Through use of strategically placed quartz crystal monitors combined with stable deposition plumes, the manufacturing variability was reduced to acceptable levels. Low deposition rates and higher rotation rates also provided some stability to azimuthal variation

Patterns of failure after adjuvant “sandwich” chemo-radio-chemotherapy in locally advanced (stage III–IVA) endometrial cancer

Purpose: To investigate oncological outcomes and patterns of recurrence of patients undergoing adjuvant “sandwich” chemo-radio-chemotherapy for locally advanced endometrial cancer. Methods: This is a multi-institutional retrospective study evaluating chart of consecutive patients undergoing chemo-radio-chemotherapy for FIGO stage III–IVA endometrial caner. Results: The study population included 45 patients who had adjuvant sandwich regimen. Median age of the study population was 66 years. The majority of patients were diagnosed with endometrioid histology and with stage III disease. After a median follow-up of 35 months, 15 patients developed recurrent disease. Three-year disease-free and overall survivals was 45% and 81%, respectively. Three-years site-specific disease-free survival was 85%, 92% and 48% for local, loco-regional, and distant recurrence, respectively. All patients included in the study had nodal dissection. Nodal assessment included: sentinel node mapping, sentinel node mapping plus backup lymphadenectomy and lymphadenectomy in 15, 6 and 24 patients, respectively. The latter group included four patients detected by suspected enlarged nodes, intraoperatively. Even after the exclusion of patients with enlarged nodes, the type of nodal assessment did not impact on survival outcomes (p > 0.2). Positive peritoneal cytology was the only factor associated with an increased risk of developing (any site) recurrence and distant-specific recurrence, independently. No factor predicted for overall survival. Conclusion: Adjuvant “sandwich” chemo-radio-chemotherapy for locally advanced endometrial cancer guarantee promising local and loco-regional controls, but distant failure rate is high, thus suggesting the need for applying other systemic treatment strategies for these patients

Developing and validating ultrasound-based radiomics models for predicting high-risk endometrial cancer

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Hysterectomy for cervical intraepithelial neoplasia: A retrospective observational multi-institutional study

none32noObjective: To analyze the clinical management, the outcomes, and the trend in hysterectomy rates (HR) in patients who underwent this procedure for cervical intraepithelial neoplasia (CIN). Methods: Multicentric retrospective observational study conducted on 242 patients who underwent hysterectomy for CIN between 2010 and 2020 in nine Italian institutions. Hysterectomy for invasive or micro-invasive neoplasia, sub-total hysterectomy, or trachelectomy were excluded. Results: A significant increase in the trend of HR for CIN was recorded (P = 0.002, r = 0.81; C.I. 95%: 0.415–0.949); HR increased from 0.46% in the year 2010 to 3.32% in 2020. The mortality rate was 0.4%, and 5% had operative complications. On definitive histopathology examination, a CIN of any grade was recorded in 71.5% of cases, and an occult invasive cancer in 1.24%. No pathology or CIN1 was found in 26.8% of cases, suggesting over treatment. During follow-up, a vaginal lesion was recorded in 5% of cases. Conclusion: A significant increase in the number of hysterectomies performed for CIN in the last 10 years was recorded. Hysterectomy for CIN can lead to complications, risk of the onset of vaginal lesions, and risk of overtreatment, and remains, in the first instance, an unacceptable treatment, to be proposed only after adequate counseling.noneCiavattini A.; Di Giuseppe J.; Marconi C.; Giannella L.; Delli Carpini G.; Paolucci M.; Fichera M.; De Vincenzo R.P.; Scambia G.; Evangelista M.T.; Bogani G.; Bertolina F.; Raspagliesi F.; Gardella B.; Spinillo A.; Dominoni M.; Monti E.; Liverani C.A.; Vercellini P.; Iorio M.; Vitobello D.; Portuesi R.; Bresciani G.; Origoni M.; Cantatore F.; Pellegri A.M.; Moriconi L.; Serri M.; Chiari A.; Sopracordevole F.; Barbero M.; Parazzini F.Ciavattini, A.; Di Giuseppe, J.; Marconi, C.; Giannella, L.; Delli Carpini, G.; Paolucci, M.; Fichera, M.; De Vincenzo, R. P.; Scambia, G.; Evangelista, M. T.; Bogani, G.; Bertolina, F.; Raspagliesi, F.; Gardella, B.; Spinillo, A.; Dominoni, M.; Monti, E.; Liverani, C. A.; Vercellini, P.; Iorio, M.; Vitobello, D.; Portuesi, R.; Bresciani, G.; Origoni, M.; Cantatore, F.; Pellegri, A. M.; Moriconi, L.; Serri, M.; Chiari, A.; Sopracordevole, F.; Barbero, M.; Parazzini, F