22 results on '"Ankur Dhar"'
Search Results
2. Optilume® drug-coated balloon dilation for the treatment of refractory post-TURP bladder neck contracture
- Author
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Darshan Sitharthan, Saima Islam, Basil Razi, Ankur Dhar, and Justin Vass
- Subjects
Bladder neck contracture ,Optilume ,Balloon dilation ,Transurethral resection of the prostate ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
This case report presents the first use of Optilume® drug-coated balloon (DCB) technology for the management of post-transurethral resection of the prostate bladder neck contracture (BNC), a condition often resistant to traditional treatments. A 62-year-old male with recurrent BNC, unresponsive to multiple operative interventions, underwent treatment with the Optilume® DCB, resulting in significant symptom resolution without further invasive procedures. This novel application of DCB technology, delivering paclitaxel directly to the affected tissue, offers a promising alternative by targeting the underlying pathophysiology of BNC.
- Published
- 2024
- Full Text
- View/download PDF
3. Use of magnetic resonance imaging to guide direct repair of penile fractures—a change to the operative paradigm
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Henry Wang, Ankur Dhar, Apisara Kulapvirat, Evangeline Woodford, Sunny Nalavenkata, and Lawrence Kim
- Subjects
magnetic resonance imaging ,mri ,penile fracture ,rupture of corpus cavernosum ,localised incision ,longitudinal incision ,Medicine (General) ,R5-920 - Abstract
Penile fractures are an uncommon urological emergency, typically diagnosed on clinical grounds and require urgent operative intervention. Examination findings include penile swelling and bruising, commonly referred to as an “eggplant deformity”. Close palpation to identify the exact site of injury is often limited by pain. Subcoronal degloving, often with concurrent circumcision is the most utilised surgical approach, though risks include skin necrosis and decreased penile sensitivity. Magnetic Resonance Imaging (MRI) for penile fracture diagnosis is increasingly recognised, however, its ability to guide localised longitudinal incisions is currently undefined. A multi-centre retrospective observational study from February 2016 to February 2022 was performed. Electronic medical records were reviewed for patient demographics, presentation, injury characteristics, investigations and operative outcomes. MRI use and protocols were determined at the discretion of the treating urologist and on-duty radiologist respectively. Twenty-one patients were eligible for study inclusion. Ten patients underwent pre-operative MRI. Median time from MRI request to image acquisition was 2.5 hours (1.5–3.0). Time from presentation to surgical intervention did not significantly differ between the two groups. All patients without pre-operative MRI underwent subcoronal degloving. Six patients underwent MRI-guided localised incision successfully without requiring secondary incision or conversion to subcoronal degloving. The remaining four patients in the MRI cohort underwent degloving. Operative times were significantly shorter (p = 0.44) in the pre-operative MRI group, with a median duration of 1.11 hours (0.98–1.17), compared to 1.5 hours (1.20–1.75) in the non-MRI cohort. Median length of stay was 1 day in both groups. No Clavien Dindo 2 or greater complications were observed in any patient. In this study, MRI in the pre-operative setting for penile fractures is associated with reduced operative time and was successfully used to guide localised incisions for direct repair of penile fractures. Its use has the potential to change the paradigm of penile fracture management and operative repair.
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- 2023
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4. Open Approaches to Radical Nephrectomies: A Case Report of Bilateral T3b Renal Cell Carcinoma
- Author
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Paul Ji Hoon Kim, James Lee Kovacic, Ankur Dhar, Andrew Robert Shepherd, and Matthew Wayne Winter
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nephrectomy ,renal cell carcinoma ,renal vein thrombus ,Surgery ,RD1-811 ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
A case report describing the surgical challenges of an open approach bilateral T3b renal cell carcinoma with bilateral renal vein involvement. This is the second reported case of bilateral renal cell carcinoma with extension into bilateral renal veins and inferior vena cava. This case highlights how good outcomes can be achieved with open surgical approach.
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- 2023
- Full Text
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5. Thulium laser to intraurethral Gordian Knot: A novel technique
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Paul Kim, James Kovacic, Andrew Shepherd, and Ankur Dhar
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Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Self-inserted urethral foreign bodies are an unusual albeit well documented phenomena and cause of hospital presentation. When conservative non-operative managements fail, operative management is imperative to prevent further complications including infection, stones, diverticula, and fistula formation. Minimally invasive alternatives should be considered when cystoscopic access to the foreign body is mechanically difficult. Through this case presentation, we showcase a novel technique to consider when dealing with intraurethral foreign bodies - the use of thulium laser with rigid ureteroscope. We believe this to be the first documented case of successful intraurethral foreign body fragmentation using thulium laser.
- Published
- 2024
- Full Text
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6. Basic evaluation for sacroneuromodulation with the novel use of an in-line camera to guide lead insertion
- Author
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Henry Wang, Ankur Dhar, Apisara Kulapvirat, and Audrey Wang
- Subjects
Basic Evaluation ,Sacroneuromodulation ,In-line camera ,Surgery ,RD1-811 ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Background: Sacroneuromodulation (SNM) is a technique that simulates sacral spinal nerve roots with the goal of modulating afferent neural pathways. While the exact mechanism of effect is incompletely understood, it is an effective treatment in several pelvic floor disorders including Overactive Bladder (OAB), voiding dysfunction and non-obstructive urinary retention. The placement of SNM leads is guided by fluoroscopy or anatomical landmarks. The preferred target is the S3 sacral nerve. Correct placement is confirmed through obtaining the desired motor responses of anal bellows and toe dorsiflexion. Objective: To demonstrate our operative technique for SNM lead placement, including theatre set-up, use of fluoroscopy, identification of relevant anatomical landmarks and the novel use of an in-line camera to guide lead placement. Additionally, we demonstrate the motor findings associated with the target S3, and inadvertent S2 nerve stimulation. Patient and Surgical Procedure: We routinely perform basic evaluation trials for confirmation of symptomatic improvement (50% or greater), prior to single stage system implantation. We utilise the Medtronic Interstim device (Minneapolis, MN). Fluoroscopy and an additional in-line camera are used to guide all lead insertions. Confirmation of correct lead placement is achieved through visualisation of the desired motor responses. Additionally, stimulus amplitudes of less than 2 Vs are desired. Results: The use of an in-line camera acts as an additional reference point, allowing the operator to maintain an optimal craniocaudal angle during needle insertion. This is particularly useful in patients with a high BMI, where operator vision is limited, and early in the learning curve for trainees. Motor findings associated with both inadvertent S2, and the target S3 nerve stimulation are also demonstrated in a real-time case. Conclusion: Fluoroscopy and the use of an in-line camera allows for efficient SNM lead placement into the S3 sacral foramen.
- Published
- 2023
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7. Penile pressure ulcers secondary to indwelling catheter and prone positioning for COVID-19 infection
- Author
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Henry Wang, Ankur Dhar, Manish Patel, and Lawrence Kim
- Subjects
Pressure ulcer ,Prone positioning ,Catheter ,COVID-19 ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Prone ventilation is an effective and increasingly utilised tool in the management of Acute Respiratory Distress Syndrome (ARDS), a common sequela of COVID-19 infection. However, its use is associated with a significant risk of pressure ulcers.We report a unique case of prone positioning, catheter-related penile pressure ulcer. Clinical awareness, early recognition and regular repositioning is crucial in the prevention of this complication.
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- 2023
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8. Ureteric Injury Secondary to Inadvertent Cannulation by Suprapubic Catheter
- Author
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Henry Wang, Ankur Dhar, and Audrey Wang
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ureteric injury ,neurogenic bladder ,suprapubic catheter ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
None.
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- 2023
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9. Corpora cavernosum abscess and corporoglanular fistula following penile shunts for ischemic priapism
- Author
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Henry Wang, Ankur Dhar, and Audrey Wang
- Subjects
Penile abscess ,Corporal abscess ,Corporoglanular fistula ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Ischemic priapism is a urologic emergency requiring urgent intervention to prevent tissue necrosis and preserve erectile function. Cases refractory to aspiration and intra-cavernosal sympathomimetic therapy requires timely surgical shunting. Corpus cavernosum abscess following penile shunts is an exceedingly rare complication, with as few as 2 previous reported cases.We report our experience and outcome in the case of a 50-year-old patient who developed a corpora cavernosum abscess and concurrent corporoglanular fistula, following penile shunt procedures for ischemic priapism.
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- 2023
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10. A Diagnostic Dilemma Identifies a Rare Case of a Prolapsed Ureterocele in Pregnancy
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James Kovacic, Ankur Dhar, Andrew R.H. Shepherd, and Amanda Chung
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ureterocele ,pregnancy ,prolapse ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
None.
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- 2023
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11. Novel Finding of Lower Genital Tract Arteriovenous Malformation Leading to Massive Urethral Bleed
- Author
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Paul Kim, James Kovacic, Ankur Dhar, and Andrew R.H. Shepherd
- Subjects
arteriovenous malformation ,urethrorrhagia ,catheter injury ,haematuria ,penile avm ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
None.
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- 2023
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12. The perils of penile enhancement: case report of a fulminant penile infection
- Author
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Nicole Wen Mun Khor, Ankur Dhar, and Alistair Cameron-Strange
- Subjects
Penile diseases ,Urologic diseases ,Penis ,Infections ,Hyaluronic acid ,Injections ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Abstract Background Penile enhancement with injectable agents is a rising trend and yet has received little scientific attention despite the potential for serious complications. These include cosmetic, functional and systemic complications that may require complex penile reconstructive surgery. We report a case of delayed severe infection following penile filler insertion leading to multi-organ failure and intensive care support. Case presentation A 31-year-old man presented with fevers and progressive pain and swelling of the penile shaft, 3 days after unprotected sexual intercourse. The patient received subcutaneous hyaluronic filler injections at a cosmetic clinic for penile enlargement two months prior to presentation. Relevant social history include polysubstance abuse and multiple sexual partners. Physical examination revealed gross penile oedema and erythema, with a ventral curvature of the penile shaft and a superficial abrasion on the distal ventral penile shaft. Within 24 h the patient developed septic shock with anuria, hypotension and fevers to 40 °C, requiring transfer to the Intensive Care Unit (ICU) for vasopressor and inotropic support. Intraoperative penile exploration revealed multiple pus stained fillers which were drained and grew Streptococcus Pyogenes on cultures. There was no abscess or evidence of necrotising fasciitis intraoperatively. The patient improved with intravenous antibiotics and was stepped down from the ICU after four days and discharged on day eight. One month post admission there was significant superficial skin loss to both ventral and lateral aspect of the penis, with healthy granulation tissue at the base. The patient opted for conservative management with regular dressings. He reported normal sexual and urinary function three months post admission. Conclusion This is the first published case of sepsis from a penile infection in the context of hyaluronic acid penile fillers. In an era of escalating demand for penile cosmetic procedures, there is an increasing need for early recognition and appropriate management of penile filler infections. We report an unusual case of a localised penile infection rapidly progressing to sepsis with multi-organ failure requiring intensive care support. The case demonstrates early surgical intervention with targeted antimicrobials can result in successful eradication of infection, with satisfactory cosmetic and functional outcomes for patients.
- Published
- 2021
- Full Text
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13. A narrative review: evaluation and surgical management of persistent and recurrent urinary incontinence after previous surgical treatment
- Author
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James Kovacic, Ankur Dhar, Andrew Shepherd, and Amanda Chung
- Subjects
Reproductive Medicine ,Urology - Published
- 2023
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14. Penile prosthesis no longer intervention of last resort for erectile dysfunction?
- Author
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James Kovacic, Ankur Dhar, Andrew Shepherd, Ioana Popa, and Amanda Chung
- Subjects
General Medicine - Published
- 2023
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15. A rude awakening: management of nocturia in men
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James Kovacic, Ankur Dhar, Andrew Shepherd, and Amanda Chung
- Subjects
General Medicine - Published
- 2022
- Full Text
- View/download PDF
16. The perils of penile enhancement: case report of a fulminant penile infection
- Author
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Alistair Cameron-Strange, Ankur Dhar, and Nicole Wen Mun Khor
- Subjects
Adult ,Male ,medicine.medical_specialty ,Streptococcus pyogenes ,Urology ,Hyaluronic acid ,Necrotising fasciitis ,Context (language use) ,Case Report ,Penile diseases ,Urologic diseases ,Infections ,law.invention ,Injections ,law ,Intensive care ,Dermal Fillers ,Streptococcal Infections ,medicine ,Humans ,Abscess ,business.industry ,General Medicine ,medicine.disease ,Intensive care unit ,Diseases of the genitourinary system. Urology ,Surgery ,Anti-Bacterial Agents ,medicine.anatomical_structure ,Reproductive Medicine ,Anuria ,RC870-923 ,medicine.symptom ,Penile Infection ,business ,Penis - Abstract
Background Penile enhancement with injectable agents is a rising trend and yet has received little scientific attention despite the potential for serious complications. These include cosmetic, functional and systemic complications that may require complex penile reconstructive surgery. We report a case of delayed severe infection following penile filler insertion leading to multi-organ failure and intensive care support. Case presentation A 31-year-old man presented with fevers and progressive pain and swelling of the penile shaft, 3 days after unprotected sexual intercourse. The patient received subcutaneous hyaluronic filler injections at a cosmetic clinic for penile enlargement two months prior to presentation. Relevant social history include polysubstance abuse and multiple sexual partners. Physical examination revealed gross penile oedema and erythema, with a ventral curvature of the penile shaft and a superficial abrasion on the distal ventral penile shaft. Within 24 h the patient developed septic shock with anuria, hypotension and fevers to 40 °C, requiring transfer to the Intensive Care Unit (ICU) for vasopressor and inotropic support. Intraoperative penile exploration revealed multiple pus stained fillers which were drained and grew Streptococcus Pyogenes on cultures. There was no abscess or evidence of necrotising fasciitis intraoperatively. The patient improved with intravenous antibiotics and was stepped down from the ICU after four days and discharged on day eight. One month post admission there was significant superficial skin loss to both ventral and lateral aspect of the penis, with healthy granulation tissue at the base. The patient opted for conservative management with regular dressings. He reported normal sexual and urinary function three months post admission. Conclusion This is the first published case of sepsis from a penile infection in the context of hyaluronic acid penile fillers. In an era of escalating demand for penile cosmetic procedures, there is an increasing need for early recognition and appropriate management of penile filler infections. We report an unusual case of a localised penile infection rapidly progressing to sepsis with multi-organ failure requiring intensive care support. The case demonstrates early surgical intervention with targeted antimicrobials can result in successful eradication of infection, with satisfactory cosmetic and functional outcomes for patients.
- Published
- 2021
17. The utility of preoperative and intraoperative cultures for guiding urosepsis empirical treatment
- Author
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Brielle E Wood, David Habashy, Claire Purvis, Timothy Skyring, Darren J Mayne, and Ankur Dhar
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medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Urology ,General surgery ,030232 urology & nephrology ,medicine.disease ,Sepsis ,Empirical treatment ,03 medical and health sciences ,0302 clinical medicine ,030220 oncology & carcinogenesis ,medicine ,Surgery ,Instrumentation (computer programming) ,Ureteroscopy ,business ,Upper urinary tract - Abstract
Objective: Endoscopic upper urinary tract instrumentation is a common urological procedure; often associated with prior ureteric stenting and postoperative urosepsis. This study aimed to explore the clinical utility of preoperative urine and intraoperative urine and ureteric stent cultures in the management of urosepsis post upper urinary tract instrumentation. Methods: Prospective study involving pre-stented patients whose upper urinary tract was instrumented at a single centre between 2017 and 2018. Five cultures were collected per patient. Patients were tracked for development of postoperative urosepsis. Results: The study included 227 patients, with a 5.7% postoperative urosepsis rate. Risk of urosepsis was significantly associated with female gender, steroid use and having a colonized preoperative urine culture, intraoperative bladder urine or stent-end culture, or kidney urine culture. Patients with a colonized intraoperative bladder urine were 11 times more likely to develop urosepsis and were colonized with the same organism isolated from urosepsis cultures for 50% of cases. Conclusions: To our knowledge this is the largest cohort study which analyses five different urinary tract cultures and the relationship with postoperative urosepsis. A positive intraoperative bladder urine culture is an independent predictor of postoperative urosepsis development and causative organism, which could guide antibiotic management for these patients. Level of Evidence 3-b
- Published
- 2019
- Full Text
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18. Podium Presentations
- Author
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Ankur Dhar
- Subjects
Urology - Published
- 2019
- Full Text
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19. Podium Presentations
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Elizabeth Williams and Ankur Dhar
- Subjects
Urology - Published
- 2017
- Full Text
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20. Abstracts
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Ruth Walker, Kate Laver, Stacey George, Maria Crotty, and Ankur Dhar
- Subjects
Neurology - Published
- 2011
- Full Text
- View/download PDF
21. Determination of the mean inner potential of cadmium telluride via electron holography
- Author
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Cathal Cassidy, Ankur Dhar, and Tsumoru Shintake
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Materials science ,Physics and Astronomy (miscellaneous) ,Solid-state physics ,Condensed Matter::Other ,business.industry ,Electron energy loss spectroscopy ,02 engineering and technology ,Electron ,021001 nanoscience & nanotechnology ,Inelastic mean free path ,01 natural sciences ,Molecular physics ,Cadmium telluride photovoltaics ,Electron holography ,Condensed Matter::Materials Science ,Optics ,Electron diffraction ,0103 physical sciences ,010306 general physics ,0210 nano-technology ,business ,Electron scattering - Abstract
Mean inner potential is a fundamental material parameter in solid state physics and electron microscopy and has been experimentally measured in CdTe, a technologically important semiconductor. As a first step, the inelastic mean free path for electron scattering in CdTe was determined, using electron energy loss spectroscopy, to enable precise thickness mapping of thin CdTe lamellae. The obtained value was λi(CdTe, 300 kV) = 192 ± 10 nm. This value is relatively large, given the high density of the material, and is discussed in the text. Next, electron diffraction and specimen tilting were employed to identify weakly diffracting lattice orientations, to enable the straightforward measurement of the electron phase shift. Finally, electron holography was utilized to quantitatively map the phase shift experienced by electron waves passing through a CdTe crystal, with several different propagation vectors. Utilization of both thickness and phase data allowed computation of mean inner potential as V0 (CdTe) = 14.0 ± 0.9 V, within the range of previous theoretical estimates.
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- 2017
- Full Text
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22. Imaging Monopoles in Spin Ice via Electron Holography
- Author
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Ankur, Dhar
- Abstract
Originally proposed by Pierre Curie, magnetic monopoles in vacuum have long remained elusive to detection, but recently mergent monopoles of the microscopic H field have been shown to exist in spin ice. As such, they present a valuable testing ground for the physics of magnetic monopoles which remain elusive as high energy particles. However, signatures of monopoles in spin-ice materials have only been indirect so far, and their direct observation has remained an open challenge since their discovery. One such technique that would make this direct observation a reality is electron holography, due to the electron’s high sensitivity to magnetic fields via the Aharonov-Bohm effect. Currently the best holographic microscopes can achieve 3D spatial imaging of spin phenomena with sub-nanometer resolution. In this thesis, I explore the possibility of imaging monopoles with electron holography through experimental measurements of monopole and spin ice analogs and computational simulation of how a monopole would appear in a pyrochlore spin ice thin film. My experimental work focused on measuring the phase signal from an elongated magnetic needle, as well as artificial spin ice formed from a 2D lattice of nanoscale magnets. My simulated results show for the first time what a monopole in pyrochlore spin ice would look like if imaged using electron holography. The experimental and simulation results together help define the technical requirements and experimental signals required to achieve direct observation of magnetic monopoles in spin ice via electron holography.
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