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• Pub. Date : 2025
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ABSTRACTIntroductionPaediatric diagnostic reference levels (DRLs) are dose levels for typical medical imaging examinations for broadly defined types of equipment with weight‐stratification preferred by the International Commission on Radiological Protection. Australia has never published paediatric DRLs for general radiography. The aim of this study was to collect radiation dose metrics for commonly performed radiographic projections in children in Australia and propose weight‐based DRLs.MethodsEthics approval was granted to collect data, along with a waiver of consent. Radiographs were acquired in accordance with local protocols using direct digital X‐ray equipment for children who presented for routine radiographic imaging. A spreadsheet was provided to each centre to record the patient's age and weight, as well as tube voltage and current‐time product, source‐to‐image distance, use of a grid, additional filtration, automatic exposure control chamber selection and the displayed air kerma area product (KAP). Facility reference levels (FRLs) were calculated as the median for each X‐ray unit based on data submitted for a minimum of three patients. The 75th percentiles of the FRLs across nine X‐ray units from five centres were calculated as the proposed Local DRLs (LDRLs).ResultsThe most commonly radiographed body parts in children were the chest, wrist, abdomen, elbow and foot. The proposed LDRLs range from 4 mGy•cm2 (oblique hand in 5–15 kg) to 884 mGy•cm2 (antero‐posterior pelvis in 50–80 kg).ConclusionThe estimation of LDRLs for radiographs from a weight‐based patient study offers Australian reference values for guidance in the optimisation process.

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• Pub. Date : 2025
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As small modular reactors continue to advance, heat pipe reactors (HPRs) are being developed by multiple organizations.Designing heat pipes with optimal heat transfer capability is crucial for the effective performance of HPRs. Based on NSGA-III genetic algorithm, this paper presented the design method of a high-temperature heat pipe featuring a composite wick. The study examined the influence of heat pipe structure parameters on performance parameters and heat transfer limits. Based on the analysis, we built multi-objective modeling of heat pipe and obtained the optimal structural parameters by NSGA-III. Verification confirmed that the heat pipe met the Mach number and effective capillary radius requirements. This study provided valuable insights for improving heat pipe manufacturing techniques and reactor miniaturization.

• Book : 57(3)
• Pub. Date : 2025
• Page : pp.1-11
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SRRM2 encodes a nuclear protein, with functions in pre-mRNA splicing and the formation of nuclear speckles via liquid-liquid phase separation. Despite its critical role in cellular function, the association between SRRM2 and neurodevelopmental disorders is not well-understood. In this study, we reported a case of a patient exhibiting developmental delay, intellectual disability, delayed language development, facial dysmorphism, macrocephaly, short hands and feet, hyperphagia, and hypotonia, which are similar to the characteristics of previously reported cases of SRRM2-associated neurodevelopmental disorders. Notably, the patient became overweight and subsequently developed several obesity-related complications due to uncontrolled hyperphagia. Employing whole exome sequencing (WES) and Sanger sequencing, we identified a novel missense mutation in SRRM2 (NM_016333: c.4661A > T, p.Q1554L). This mutation is classified as “Likely Pathogenic” based on the American College of Medical Genetics and Genomics (ACMG) guideline. Overall, this study contributes to the expanding spectrum of known mutations in SRRM2, enhances our understanding of its clinical implications, and offers crucial data for the diagnosis and management of affected individuals.

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• Pub. Date : 2025
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Eccrine porocarcinoma is a tumor of the sweat gland that mostly develops from an existing benign eccrine poroma. It is a rare cutaneous malignancy with a high risk of metastasis and recurrence. Known to affect the elderly population in general with no gender discrepancy, it presents as an ulcerative mass commonly in the trunk or head/neck region. Definitive diagnosis is made by histopathological findings of peculiar pleomorphic cells with nuclear hyperchromasia and mitotic activity, surrounded by ductal lumen. The standard treatment is complete surgical excision with appropriate surgical margins; adequate work-ups to look for metastasis and timely follow ups for chances of recurrence. Here we report a case of an 82-year-old patient who presented at our department with a long-standing exophytic lesion in the head that rapidly started growing in the past few weeks. After excisional biopsy and histopathology, the diagnosis of Eccrine porocarcinoma was made.Keywords: Cutaneous; eccrine porocarcinoma; malignancy; rare.

• Book : 22(04)
• Pub. Date : 2025
• Page : pp.796-798
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• Pub. Date : 2025
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Serial crystallography (SX) enables the determination of biologically relevant structures at room temperature while minimizing radiation damage. During SX experiments, the beam center on diffraction images can shift due to X-ray beam movements or detector displacement. Consequently, the geometry file for the beam center is optimized; however, the effects of deviations from the optimal position on data processing efficiency remain unclear. This study examines how changes in the beam center influence data quality by analyzing the indexing efficiency and structure refinement of lysozyme and glucose isomerase datasets, considering shifts in the beam center parameter. The results revealed that as the beam center deviated farther from its optimal position, the indexing efficiency declined, with the extent of the effect varying significantly across indexing algorithms. XDS and MOSFLM algorithms maintained high indexing efficiencies (>90%) for shifts of ≤4 pixels (688 μm) and ≤2 pixels (344 μm), respectively, compared to data processed at the optimized beam center. Conversely, the DirAx and XGANDALF algorithms exhibited indexing efficiencies below 90% for a two-pixel shift in the beam center. These findings enhance our understanding of how beam center shifts affect SX data processing and provide valuable insights for developing effective data processing strategies.

• Book : 15(2)
• Pub. Date : 2025
• Page : pp.185-185
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Abstract Background Amino acid PET using the tracer O-(2-[18F]fluoroethyl)-L-tyrosine (FET) is one of the most reliable imaging methods for detecting glioma recurrence. Here, we hypothesized that functional MR connectivity between the metabolic active recurrent tumor region and resting-state networks of the brain could serve as a prognostic imaging biomarker for overall survival (OS). Methods The study included 82 patients (26-81 years; median ECOG performance score, 0) with recurrent gliomas following therapy (WHO-CNS 2021 grade 4 glioblastoma, n=57; grade 3 or 4 astrocytoma, n=12; grade 2 or 3 oligodendroglioma, n=13) diagnosed by FET PET simultaneously acquired with functional resting-state MR. Functional connectivity (FC) was assessed between tumor regions and seven canonical resting-state networks. Results WHO tumor grade and IDH mutation status were strong predictors of OS after recurrence (p<0.001). Overall FC between tumor regions and networks was highest in oligodendrogliomas and was inversely related to tumor grade (p=0.031). FC between the tumor region and the dorsal attention network was associated with longer OS (HR, 0.88; 95%CI, 0.80-0.97; p=0.007), and showed an independent association with OS (HR, 0.90; 95%CI, 0.81-0.99; p=0.033) in a model including clinical factors, tumor volume and MGMT. In the glioblastoma subgroup, tumor volume and FC between tumor and the visual network (HR, 0.90; 95%CI, 0.82-0.99, p=0.031) were independent predictors of survival. Conclusion Recurrent gliomas exhibit significant FC to resting-state networks of the brain. Besides tumor type and grade, high FC between the tumor and distinct networks could serve as independent prognostic factors for improved OS in these patients.

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• Pub. Date : 2025
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• Pub. Date : 2025
• Page : pp.100720-100720
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• Book : 233()
• Pub. Date : 2025
• Page : pp.116785-116785
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