Abstract:
: Background: Nonmuscle-invasive bladder cancer is diagnosed, treated, and monitored using cystoscopy. Artificial intelligence (AI) is increasingly used to augment tumor detection, but its performance is hindered by the limited availability of cystoscopic images required to form a large training data set. This study aimed to determine whether stepwise transfer learning with general images followed by gastroscopic images can improve the accuracy of bladder tumor detection on cystoscopic imaging. Materials and Methods: We trained a convolutional neural network with 1.2 million general images, followed by 8728 gastroscopic images. In the final step of the transfer learning process, the model was additionally trained with 2102 cystoscopic images of normal bladder tissue and bladder tumors collected at the University of Tsukuba Hospital. The diagnostic accuracy was evaluated using a receiver operating characteristic curve. The diagnostic performance of the models trained with cystoscopic images with or without stepwise organic transfer learning was compared with that of medical students and urologists with varying levels of experience. Results: The model developed by stepwise organic transfer learning had 95.4% sensitivity and 97.6% specificity. This performance was better than that of the other models and comparable with that of expert urologists. Notably, it showed superior diagnostic accuracy when tumors occupied >10% of the image. Conclusions: Our findings demonstrate the value of stepwise organic transfer learning in applications with limited data sets for training and further confirm the value of AI in medical diagnostics. Here, we applied deep learning to develop a tool to detect bladder tumors with an accuracy comparable with that of a urologist. To address the limitation that few bladder tumor images are available to train the model, we demonstrate that pretraining with general and gastroscopic images yields superior results.
journal_name
J Endouroljournal_title
Journal of endourologyauthors
Ikeda A,Nosato H,Kochi Y,Negoro H,Kojima T,Sakanashi H,Murakawa M,Nishiyama Hdoi
10.1089/end.2020.0919subject
Has Abstractpub_date
2020-12-04 00:00:00eissn
0892-7790issn
1557-900Xpub_type
杂志文章abstract::In this review, a simplified straightforward algorithmic approach to the metabolic evaluation and treatment of the at-risk or recurrent urolithiasis patient is provided. Eight diagnoses and eight therapies are provided, which cover over 95% of renal stone disease. ...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/end.2017.0541
更新日期:2018-05-01 00:00:00
abstract:PURPOSE:To evaluate the use of virtual endoscopy (VE) for the investigation of the pelvicaliceal unit and the depiction of its anatomic deformities. PATIENTS AND METHODS:Two study groups were prospectively enrolled in our protocol: ten patients with nonurologic pathologies, and thus without any known deformity of the ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2005.19.37
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abstract:OBJECTIVE:The aim of our study was to evaluate if there is any advantage of three-dimensional helical computed tomography (3D-HCT) over intravenous urogram (IVU) in the morphometric and morphological analysis of lower pole spatial anatomy of the kidney. PATIENTS AND METHODS:We analyzed 52 renal collecting systems in 3...
journal_title:Journal of endourology
pub_type: 临床试验,杂志文章
doi:10.1089/end.2009.0262
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abstract:: Objectives: To evaluate the feasibility of robot-assisted fluoroscopy-guided (RAG) puncture and to compare RAG puncture, utilizing a novel robot system for percutaneous renal access, with ultrasound-guided (USG) puncture. Materials and Methods: ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2019.0432
更新日期:2019-12-01 00:00:00
abstract:INTRODUCTION AND OBJECTIVES:There is a need to improve prescreening determination of prostate cancer to better select patients who need biopsy. Such a strategy properly implemented, will decrease the number of negative biopsies for prostate cancer and in turn better balance the risks and morbidity for patients recommen...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2013.0383
更新日期:2014-03-01 00:00:00
abstract:OBJECTIVE:To assess if the presence of a lower pole stone (LPS) decreases the stone-free (SF) rate following retrograde intrarenal surgery (RIRS). The second purpose was to assess the result of RIRS for LPS and to identify predictors of SF status. PATIENTS AND METHODS:We retrospectively analyzed 205 procedures in 162 ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2013.0515
更新日期:2014-02-01 00:00:00
abstract::Endoscopic treatment of upper-tract transitional-cell carcinoma (TCC) is well established. Nevertheless, many patients still required major ablative surgery. We have applied our experience with laparoscopic nephrectomy to the performance of laparoscopic nephroureterectomy in order to make the management of upper-tract...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.1998.12.139
更新日期:1998-04-01 00:00:00
abstract:BACKGROUND AND PURPOSE:To evaluate the safety and efficacy of percutaneous nephrolithotomy (PCNL) for the management of complete staghorn calculi in children journal_title:Journal of endourology pub_type: 杂志文章 doi:10.1089/end.2005.19.968 更新日期:2005-10-01 00:00:00
abstract:INTRODUCTION:The Endockscope combines a smartphone, a battery powered flashlight and a fiberoptic cystoscope allowing for mobile videocystoscopy. We compared conventional videocystoscopy with the Endockscope paired with next generation smartphones in an ex-vivo porcine bladder to evaluate its image quality. MATERIALS ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2018.0275
更新日期:2018-08-01 00:00:00
abstract:BACKGROUND AND PURPOSE:As many as 96% of patients report some kind of discomfort/pain during transrectal ultrasonography (TRUS)-guided prostate biopsy, and when pain is severe, it may be necessary to decrease the planned number of biopsies or interrupt the procedure. Various modalities have been recommended to alleviat...
journal_title:Journal of endourology
pub_type: 杂志文章,随机对照试验
doi:10.1089/end.2006.20.525
更新日期:2006-07-01 00:00:00
abstract:PURPOSE:To demonstrate the safety and efficacy of percutaneous nephrolithotomy (PCNL) for management of large renal stones between single-functioning kidney and double-kidney patients. PATIENTS AND METHODS:Thirty single-functioning kidneys and 30 double-kidney patients with a mean age of 38.5 (±15.6) years in the sing...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2011.0083
更新日期:2012-03-01 00:00:00
abstract:: Objectives: To assess the effect of irrigation settings and the size of ureteral access sheath (UAS) on the maximal intra-pelvic pressure (IPPmax) during ureteroscopy (URS) in pigs. Materials and Methods: In supine position, th...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2019.0317
更新日期:2019-09-01 00:00:00
abstract:INTRODUCTION:Semirigid and flexible ureterorenoscopy (URS) procedures are safe and efficient treatment options for urolithiasis of all localizations. Sometimes, a Double-J stent is placed in preparation of definitive treatment. The aim of our study was to evaluate the influence of prestenting on the outcome of URS. PA...
journal_title:Journal of endourology
pub_type: 杂志文章,多中心研究
doi:10.1089/end.2015.0109
更新日期:2016-03-01 00:00:00
abstract:PURPOSE:To compare the maximal active deflection capabilities of a newly designed dual-deflection ureteroscope with those of a standard flexible ureteroscope. MATERIALS AND METHODS:The dual-deflection ureteroscope is similar in design to single-deflection ureteroscopes with the addition of a second, more proximal unid...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/089277904322959761
更新日期:2004-03-01 00:00:00
abstract::Technique for apical dissection and control of the dorsal vein complex (DVC) during robot-assisted laparoscopic radical prostatectomy (RALP) affects blood loss, apical positive margins, and recovery of urinary control. Over the past 7 years, our technique for apical dissection has been spurred by the overarching goal ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2012.0415
更新日期:2012-12-01 00:00:00
abstract:INTRODUCTION:Histotripsy is a nonthermal, noninvasive, pulsed ultrasound technology that homogenizes tissue within the targeted volume. From previous experiments, it appeared that the resultant fibrotic response from histotripsy was limited compared with the typical tissue response seen after thermoablation. The object...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2014.0585
更新日期:2015-07-01 00:00:00
abstract:PURPOSE:Robot-assisted laparoscopic prostatectomy (RALP) is an increasingly popular treatment choice among men with clinically localized prostate cancer and has resulted in the need to adequately train urologists to perform the procedure. We reviewed the City of Hope experience to determine if the extent of fellow invo...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2008.0378
更新日期:2009-02-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Retrograde ureteroscopic marsupialization is a pure natural orifice translumenal endoscopic surgery (NOTES). We retrospectively examined the feasibility and safety of this technique to manage symptomatic simple renal cysts. PATIENTS AND METHODS:Sixteen patients with simple renal cysts were selec...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2009.0676
更新日期:2011-01-01 00:00:00
abstract:PURPOSE:Our aim was to evaluate the safety and efficacy of percutaneous nephrolithotomy (PCNL) with ultrasonography (US)-guided renal access in the lateral decubitus flank position. PATIENTS AND METHODS:From July 2006 to March 2008, 40 patients with renal stones > 2 cm underwent PCNL with US-guided renal access in the...
journal_title:Journal of endourology
pub_type: 临床试验,杂志文章
doi:10.1089/end.2008.0433
更新日期:2009-01-01 00:00:00
abstract:PURPOSE:The goal of this study is to identify the most efficient sweeping angle (SA) during photoselective vaporization of the prostate (PVP). MATERIALS AND METHODS:Experiments were conducted with GreenLight XPS™ laser at 120 and 180 W. Ten blocks of porcine kidney were used for each SA (0, 15, 30, 45, 60, 90, and 120...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2011.0356
更新日期:2012-04-01 00:00:00
abstract:: Objective: To evaluate the learning curve in an untrained resident surgeon for the initial case series of tension-free vaginal tape-obturator (TVT-O) to treat stress urinary incontinence. Materials and Methods: A retrospective ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2019.0571
更新日期:2020-02-01 00:00:00
abstract:PURPOSE:Percutaneous nephrolithotomy (PNL) is established in urology practice with routine use of fluoroscopic guidance. Herein, we retrospectively evaluated the potential factors affecting the fluoroscopic screening time (FST) during PNL. MATERIALS AND METHODS:A total of 282 patients with documented FST in detail dur...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2009.0256
更新日期:2009-11-01 00:00:00
abstract::The appropriate position of the hand-access device and trocars for hand-assisted laparoscopic surgery depends on several factors, including the surgeon's preference, physical stature, and handedness; the patient's anatomy; and the type of procedure being performed. This article reviews the options, including measures ...
journal_title:Journal of endourology
pub_type: 杂志文章,评审
doi:10.1089/089277904323056843
更新日期:2004-05-01 00:00:00
abstract::Small renal lesions often confer relatively low oncologic risk and, as such, dictate for treatment strategies with low morbidity. Minimally invasive ablative techniques have been developed and can deliver good outcomes where used judiciously. The potential risks of treatment relate to the method of ablation, the route...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2009.0542
更新日期:2010-05-01 00:00:00
abstract:INTRODUCTION:Prestenting of the ureter is commonly performed to allow for passive dilation and better access to the urinary system during subsequent procedures. There is no level 1 evidence on the duration of prestenting and EAU guidelines suggest a 1-2 weeks duration. MATERIALS AND METHODS:Our primary aim is to inves...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2018.0872
更新日期:2019-04-01 00:00:00
abstract:PURPOSE:We describe and evaluate a new transperineal laparoscopic approach for male patients, designed to facilitate laparoscopic prostatectomy and cystectomy. PATIENTS AND METHODS:We operated on 12 patients. We did three laparoscopic prostatectomies and nine laparoscopic cystectomies. On five, an ileal conduit was ma...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2010.0247
更新日期:2011-04-01 00:00:00
abstract:: Purpose: Photoselective vaporization of the prostate (PVP) with a 940-nm diode laser is an option for treating symptoms caused by benign prostatic hyperplasia (BPH). Here, we present our experience using this technology. Methods: ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2019.0311
更新日期:2019-12-01 00:00:00
abstract:BACKGROUND AND PURPOSE:Renal Fine Needle Aspiration Cytology (FNAC) has gained popularity due to increasing options in management of renal lesions such as energy ablation and active surveillance. The diagnostic yield of renal FNAC varies between 40-90%. We hypothesized that adequate and diagnostic FNA samples would be ...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2008.9724
更新日期:2008-10-01 00:00:00
abstract:PURPOSE:To describe and evaluate a novel method of direct ultrasonography (US)-guided percutaneous embolization of renal pseudoaneurysm. PATIENTS AND METHODS:Fourteen patients with severe hematuria were included in this study from February 2005 to February 2006. They included five patients with penetrating renal traum...
journal_title:Journal of endourology
pub_type: 临床试验,杂志文章
doi:10.1089/end.2008.0559
更新日期:2009-06-01 00:00:00
abstract:PURPOSE:To examine the effects of antibiotic prophylaxis on postoperative infection rate in patients with negative urine cultures undergoing ureteroscopy (URS). PATIENTS AND METHODS:Using the Clinical Research Office of the Endourological Society (CROES) URS Global Study database, patients with a negative baseline uri...
journal_title:Journal of endourology
pub_type: 杂志文章
doi:10.1089/end.2014.0470
更新日期:2015-02-01 00:00:00