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Article ; Online: [17. Fundamentals and Applications of Fast Gradient Echo].

Nakamura, Masafumi

2023 Volume 79, Issue 6, Page(s) 588–594

MeSH term(s)	Magnetic Resonance Imaging ; Echo-Planar Imaging
Language	Japanese
Publishing date	2023-06-21
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2269092-X
ISSN	1881-4883 ; 0369-4305
ISSN (online)	1881-4883
ISSN	0369-4305
DOI	10.6009/jjrt.2023-2208
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Article ; Online: [5. Evaluation of Fat Suppression Effect].

Nakamura, Masafumi

Nihon Hoshasen Gijutsu Gakkai zasshi

2021 Volume 77, Issue 10, Page(s) 1231–1237

MeSH term(s)	Image Enhancement ; Magnetic Resonance Imaging
Language	Japanese
Publishing date	2021-10-20
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2269092-X
ISSN	1881-4883 ; 0369-4305
ISSN (online)	1881-4883
ISSN	0369-4305
DOI	10.6009/jjrt.2021_JSRT_77.10.1231
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Article ; Online: Dependence of apparent diffusion coefficient on slice position in magnetic resonance diffusion imaging.

Takatsu, Yasuo / Nakamura, Masafumi / Suzuki, Yuichi / Miyati, Tosiaki

Magnetic resonance imaging

2023 Volume 99, Page(s) 41–47

Abstract: Purpose: The position dependence of the apparent diffusion coefficient (ADC) in magnetic resonance imaging (MRI) by echo-planar imaging (EPI)- and turbo spin echo (TSE)-diffusion-weighted imaging (DWI) was assessed using phantoms.: Methods: Six pure ... ...

Abstract	Purpose: The position dependence of the apparent diffusion coefficient (ADC) in magnetic resonance imaging (MRI) by echo-planar imaging (EPI)- and turbo spin echo (TSE)-diffusion-weighted imaging (DWI) was assessed using phantoms. Methods: Six pure water-filled containers were placed parallel to the direction of the static magnetic field from the center of the magnetic field to the foot direction (five containers) and the head direction (one container). Six slice positions were set, and a cross-section image was scanned at the center of each container using a 1.5-T MRI scanner. Diffusion times for both EPI- and TSE-DWI were matched as much as possible. The slice thickness was adjusted to match the signal-to-noise ratio (SNR) at the center of the magnetic field for both sequences. A B Results: ADC decreased significantly with distance from the center of the magnetic field for both EPI-DWI and TSE-DWI (P < 0.05). TSE-ADC was significantly higher than EPI-ADC for all combinations (P < 0.01). Based on the Friedman test, the SNR of EPI- and TSE-DWI was significantly different and depended on the slice position (P < 0.01). The Pearson correlation coefficient between ADC and SNR was 0.78 in EPI-DWI and 0.60 in TSE-DWI, whereas that between ADC and FA was 0.97 in EPI-DWI and 0.94 in TSE-DWI. The FA decreased by 0.048 and 0.047° per mm from the center of the magnetic field to head and foot directions, respectively. Conclusion: ADC depends on the slice position and decreases with an increase in distance from the magnetic field center. Caution should be taken when comparing and quantitatively evaluating the ADC at sites shifted in the long-axis direction.
MeSH term(s)	Magnetic Resonance Imaging/methods ; Diffusion Magnetic Resonance Imaging/methods ; Echo-Planar Imaging/methods ; Signal-To-Noise Ratio ; Magnetic Resonance Spectroscopy ; Reproducibility of Results
Language	English
Publishing date	2023-01-20
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	604885-7
ISSN	1873-5894 ; 0730-725X
ISSN (online)	1873-5894
ISSN	0730-725X
DOI	10.1016/j.mri.2023.01.009
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Zs.A 1817: Show issues

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Article ; Online: The current status and future directions of robotic pancreatectomy.

Nakata, Kohei / Nakamura, Masafumi

Annals of gastroenterological surgery

2021 Volume 5, Issue 4, Page(s) 467–476

Abstract: Robotic surgery has emerged as an alternative to laparoscopic surgery and it has also been applied to pancreatectomy. With the increase in the number of robotic pancreatectomies, several studies comparing robotic pancreatectomy and conventional open or ... ...

Abstract	Robotic surgery has emerged as an alternative to laparoscopic surgery and it has also been applied to pancreatectomy. With the increase in the number of robotic pancreatectomies, several studies comparing robotic pancreatectomy and conventional open or laparoscopic pancreatectomy have been published. However, the use of robotic pancreatectomy remains controversial. In this review, we aimed to provide a comprehensive overview of the current status of robotic pancreatectomy. Various aspects of robotic pancreatectomy and conventional open or laparoscopic pancreatectomy are compared, including the benefits, limitations, oncological efficacy, learning curves, and costs. Both robotic pancreatoduodenectomy and distal pancreatectomy have favorable or comparable outcomes to conventional procedures, and robotic pancreatectomy has the potential to be an alternative to open or laparoscopic procedures. However, there are still several disadvantages to robotic platforms, such as prolonged operative duration and the high cost of the procedure. These disadvantages will be improved by developing instruments, overcoming the learning curve, and increasing the number of robotic pancreatectomies. In addition, robotic pancreatectomy is still in the introductory period in most centers and should only be used in accordance with strict indications.
Language	English
Publishing date	2021-03-04
Publishing country	Japan
Document type	Journal Article ; Review
ISSN	2475-0328
ISSN (online)	2475-0328
DOI	10.1002/ags3.12446
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Article ; Online: Fluorescence navigation surgery for sigmoid colon diverticulitis with adjacent organ fistula: ureteral navigation using a fluorescent ureteral catheter and blood flow evaluation by indocyanine green - a video vignette.

Tamura, Koji / Fujimoto, Takaaki / Nagayoshi, Kinuko / Mizuuchi, Yusuke / Ohuchida, Kenoki / Nakamura, Masafumi

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland

2024

Language	English
Publishing date	2024-02-23
Publishing country	England
Document type	Letter
ZDB-ID	1440017-0
ISSN	1463-1318 ; 1462-8910
ISSN (online)	1463-1318
ISSN	1462-8910
DOI	10.1111/codi.16924
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Zs.A 5799: Show issues

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Article: Severe hemothorax due to traumatic fracture of thoracic vertebra.

Ozono, Keigo / Son, Kiwa / Momii, Kenta / Morifuji, Yoshihiro / Ikenaga, Naoki / Nakamura, Masafumi

Surgical case reports

2024 Volume 10, Issue 1, Page(s) 26

Abstract: Background: Hemothorax occurs in approx. 0.4% of all chest injury patients, but hemothorax due to a thoracic vertebral fracture is rare.: Case presentation: A 76-year-old Japanese man was transported to our hospital for right hemothorax due to a car ... ...

Abstract	Background: Hemothorax occurs in approx. 0.4% of all chest injury patients, but hemothorax due to a thoracic vertebral fracture is rare. Case presentation: A 76-year-old Japanese man was transported to our hospital for right hemothorax due to a car accident. We performed emergency hemostasis surgery and tried to stop the bleeding by several methods, but it was difficult to control the bleeding because the bleeding point was an artery branch that runs in front of the vertebral body. Conclusion: It is important to be aware that a fractured vertebra can damage the aorta's arterial branch and follow a severe course.
Language	English
Publishing date	2024-01-24
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2809613-7
ISSN	2198-7793
ISSN	2198-7793
DOI	10.1186/s40792-024-01819-8
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Article ; Online: Higher incidence of cholelithiasis with Roux-en-Y reconstruction compared with Billroth-I after laparoscopic distal gastrectomy for gastric cancer: a retrospective cohort study.

Moriyama, Taiki / Ohuchida, Kenoki / Ohtsuka, Takao / Shindo, Koji / Ikenaga, Naoki / Nakata, Kohei / Nakamura, Masafumi

Langenbeck's archives of surgery

2024 Volume 409, Issue 1, Page(s) 75

Abstract: Purpose: Cholelithiasis occurs often after gastrectomy. However, no consensus has been established regarding the difference in the incidence of postgastrectomy cholelithiasis with different reconstruction methods. In this study, we examined the ... ...

Abstract	Purpose: Cholelithiasis occurs often after gastrectomy. However, no consensus has been established regarding the difference in the incidence of postgastrectomy cholelithiasis with different reconstruction methods. In this study, we examined the frequency of cholelithiasis after two major reconstruction methods, namely Billroth-I (B-I) and Roux-en-Y (R-Y) following laparoscopic distal gastrectomy (LDG) for gastric cancer. Methods: Among 696 gastric cancer patients who underwent LDG between April 2000 and March 2017, after applying the exclusion criteria, 284 patients who underwent B-I and 310 who underwent R-Y were examined retrospectively. The estimated incidence of cholelithiasis was compared between the methods, and factors associated with the development of cholelithiasis in the gallbladder and/or common bile duct were investigated. Results: During the median follow-up of 61.2 months, 52 patients (8.8%) developed cholelithiasis postgastrectomy; 12 patients (4.2%) after B-I and 40 (12.9%) after R-Y (p = 0.0002). Among them, choledocholithiasis was more frequent in patients who underwent R-Y (n = 11, 27.5%) vs. B-I (n = 1, 8.3%) (p = 0.0056). Univariate and multivariate analyses revealed that male sex, body mass index > 22.5 kg/m Conclusion: Regarding cholelithiasis development, B-I reconstruction should be preferred whenever possible during distal gastrectomy.
MeSH term(s)	Humans ; Male ; Stomach Neoplasms/epidemiology ; Stomach Neoplasms/surgery ; Stomach Neoplasms/complications ; Retrospective Studies ; Incidence ; Postoperative Complications/epidemiology ; Postoperative Complications/etiology ; Postoperative Complications/surgery ; Anastomosis, Roux-en-Y/adverse effects ; Anastomosis, Roux-en-Y/methods ; Gastrectomy/adverse effects ; Gastrectomy/methods ; Laparoscopy/adverse effects ; Laparoscopy/methods ; Choledocholithiasis/surgery ; Treatment Outcome
Language	English
Publishing date	2024-02-27
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1423681-3
ISSN	1435-2451 ; 1435-2443
ISSN (online)	1435-2451
ISSN	1435-2443
DOI	10.1007/s00423-024-03267-2
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Article: Epidermoid cyst of the testis: A report of three cases.

Usui, Kimitsugu / Yamashita, Ryo / Sakura, Yuma / Nakamura, Masafumi / Shinsaka, Hideo / Matsuzaki, Masato / Niwakawa, Masashi

Clinical case reports

2024 Volume 12, Issue 4, Page(s) e8577

Abstract: Testicular epidermoid cysts have characteristic findings. Testicular tumor markers are negative in patients with epidermoid cysts. Clear margins and sole and small testicular tumors (20 mm or less) suggest the possibility of epidermoid cyst. Testicular- ... ...

Abstract	Testicular epidermoid cysts have characteristic findings. Testicular tumor markers are negative in patients with epidermoid cysts. Clear margins and sole and small testicular tumors (20 mm or less) suggest the possibility of epidermoid cyst. Testicular-sparing surgery with intraoperative frozen section examination should be performed when suspecting epidermoid cysts. Testicular epidermoid cysts are rare tumors that account for 1% of all testicular tumors and are often clinically misdiagnosed as malignant lesions. We report three cases of epidermoid cysts. The chief manifestations were scrotal induration in two patients and pruritus scrotum in one. The median age of the patients was 23 years (18-30). All tumors were determined to be sole lesions (<20 mm in diameter). Testing for tumor markers in all patients revealed negative results. We could not rule out malignancy; hence, we performed high inguinal orchiectomy in all cases. Histologically, the inner walls of the cysts were lined with stratified squamous epithelium; their contents were keratinized. All patients were diagnosed with epidermoid cysts.
Language	English
Publishing date	2024-03-31
Publishing country	England
Document type	Case Reports
ZDB-ID	2740234-4
ISSN	2050-0904
ISSN	2050-0904
DOI	10.1002/ccr3.8577
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Article ; Online: Efficacy and Safety Evaluation of Energy Devices in Bench Surgery for Pancreas Transplantation.

Kaku, Keizo / Kubo, Shinsuke / Sato, Yu / Mei, Takanori / Noguchi, Hiroshi / Okabe, Yasuhiro / Nakamura, Masafumi

The Journal of surgical research

2024 Volume 298, Page(s) 149–159

Abstract: Introduction: Bench surgery for the preparation of deceased donor pancreatic grafts is labor-intensive and time-consuming. We hypothesized that energy devices could be used during bench surgery to decrease the bench surgery time. However, because bench ... ...

Abstract	Introduction: Bench surgery for the preparation of deceased donor pancreatic grafts is labor-intensive and time-consuming. We hypothesized that energy devices could be used during bench surgery to decrease the bench surgery time. However, because bench surgery has two unique characteristics, wet conditions and no blood flow in the vessels, it is necessary to verify the safety and efficacy under such conditions. Methods: In an animal tissue model, we validated both ultrasonic and bipolar energy devices: Harmonic Shears and the LigaSure (LS) vessel-sealing device by evaluating heat spread and pressure resistance under bench surgery conditions. In a clinical evaluation of the LS, we compared the outcomes of 22 patients in two different bench surgery groups: with and without the use of the LS. Results: Clinically, the bench surgery time was significantly shorter in the LS group than that in the conventional group (P < 0.001). In the animal tissue experiments, the highest temperature in bench surgery conditions was 60.4°C after 1 s at a 5-mm distance in the LS group. Pressure resistance of ≥ 750 mmHg was achieved in almost all trials in both veins and arteries, with no difference between Harmonic Shears and LS. There was more surgical smoke visually in bench conditions versus in dry conditions and under half bite versus full bite conditions. Conclusions: The encouraging results of our exploratory clinical and animal studies of the energy devices suggest that they may be useful in the setting of bench surgery.
Language	English
Publishing date	2024-04-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	80170-7
ISSN	1095-8673 ; 0022-4804
ISSN (online)	1095-8673
ISSN	0022-4804
DOI	10.1016/j.jss.2024.03.009
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Zs.A 178: Show issues

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Article ; Online: Outcomes and Cost Comparison of 3 Different Laparoscopic Approach for Living Donor Nephrectomy: A Retrospective, Single-Center, Inverse Probability of Treatment Weighting Analysis of 551 Cases.

Noguchi, Hiroshi / Shingaki, Kodai / Sato, Yu / Kubo, Shinsuke / Kaku, Keizo / Okabe, Yasuhiro / Nakamura, Masafumi

Transplantation proceedings

2024 Volume 56, Issue 3, Page(s) 482–487

Abstract: Background: At our institution, we switched from hand-assisted retroperitoneal laparoscopic donor nephrectomy (HRN) to hand-assisted transperitoneal laparoscopic donor nephrectomy (HTN); we later switched to standard retroperitoneal laparoscopic donor ... ...

Abstract	Background: At our institution, we switched from hand-assisted retroperitoneal laparoscopic donor nephrectomy (HRN) to hand-assisted transperitoneal laparoscopic donor nephrectomy (HTN); we later switched to standard retroperitoneal laparoscopic donor nephrectomy (SRN). This study was performed to evaluate outcomes and hospital costs among the 3 techniques. Methods: This retrospective, observational, single-center, inverse probability of treatment weighting analysis study compared the outcomes among 551 cases of living donor kidney transplantation between 2014 and 2022. Results: After the inverse probability of treatment weighting analysis, there were 114 cases in the HRN group, 204 cases in the HTN group, and 213 cases in the SRN group. Donor complication rates were lowest in the SRN group but did not differ between the HRN and HTN groups (1.1 vs 4.4 and 5.9%, P = .021). Donors in the SRN group had the lowest serum C-reactive protein concentrations on postoperative day 1 (4.3 vs 10.5 and 7.8 mg/dL, P < .001) and the shortest postoperative stay (4.3 vs 7.4 and 8.4 days, P < .001). Donors in the SRN group had the lowest total cost among the 3 groups (8868 vs 9709 and 10,592 USD, P < .0001). Donors in the SRN group also had the lowest costs in terms of "basic medical fees," "medication and injection fees," "Intraoperative drug and material costs," and "testing fees." Furthermore, the presence of complications was significantly correlated with higher total hospital costs (P < .001). Conclusion: SRN appeared to have the least invasive and complication, and a potential cost savings compared with the HRN and HTN.
MeSH term(s)	Humans ; Nephrectomy/economics ; Nephrectomy/methods ; Retrospective Studies ; Living Donors ; Male ; Female ; Laparoscopy/economics ; Laparoscopy/methods ; Kidney Transplantation/economics ; Kidney Transplantation/methods ; Adult ; Middle Aged ; Treatment Outcome ; Hospital Costs ; Postoperative Complications/economics ; Tissue and Organ Harvesting/economics ; Tissue and Organ Harvesting/methods ; Length of Stay/economics
Language	English
Publishing date	2024-02-07
Publishing country	United States
Document type	Journal Article ; Comparative Study ; Observational Study
ZDB-ID	82046-5
ISSN	1873-2623 ; 0041-1345
ISSN (online)	1873-2623
ISSN	0041-1345
DOI	10.1016/j.transproceed.2024.01.009
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