この作品は、共同研究や研修経験プログラム（CREATE）自然科学から発見グラントとカナダの工学研究評議会（NSERC）からの補助金によって支えられている。

著者らは、開示することは何もありません。

また、間隔癌症例の前にマンモグラムにおける構築の乱れを検出するための機械学習とCADとして知られているデジタル画像処理及びパターン認識の洗練された技術のシリーズを提示している。方法は、マンモグラフィ画像内に存在配向テクスチャパターンの分析に基づいている。我々の関連研究で提案されているいくつかのより多くの機能を含む、我々の方法は、患者が4未満のFP / 22...

乳がんは、女性に影響を与える主要な疾患であり、女性は1,2の癌関連死の第二の主要な原因である。生存の可能性および乳癌の初期段階における効果的な治療を介して影響を受けた患者の予後を改善するために、疾患は、できるだけ早期に検出する必要がある。乳癌の症例のレトロスペクティブ分析において、異常の微妙な兆候は、以前に取得したスクリーニングマンモグラフィー3,4で観察された。構築の乱れ5,6を検出することが困難である乳癌の可能性の初期段階のいずれかのような局所的なマンモグラフィ徴候である。関連するパターンがぼんやり見えていない明確な質量の乳房の正常な構造の歪みと記載されている。建築歪みが乳房の質量または腫瘍の形成の初期段階で表示される可能性。我々は、スクリーニングのマンモグラムの前乳癌cの検出に得られるという仮説を立てウルド特に、構築の乱れの乳癌の初期段階の微妙な徴候を含む。 図1aは、スクリーニングで発見癌の場合の事前のマンモグラフィ画像を示している。放射線科医（JELD）によって識別異常の領域が赤い四角で概説されている。従来のマンモグラムは24ヶ図1bに示す検出マンモグラムの前に採取した。前マンモグラムは、スクリーニングの元のインスタンスでがんの徴候がないことが宣言されていた。レトロスペクティブ分析において、検出マンモグラムと比較して、検出された癌の部位に関連する疑わしい領域を放射線科医によって標識し、マンモグラムの前に赤で概説されている。疑わしい領域は骨片を含む構造的ひずみの兆候が含まれています。 コンピュータ支援診断（CAD）技術およびシステムは、ブレアの検出感度の増加を達成するための可能性を提供ST癌2,7-9。しかしながら、このような質量および石灰化などの乳癌の他の徴候の検出に関する文献に存在し、多くの刊行物に比較して、研究はごく少数の非存在下で構築の乱れの検出が報告されてい中央マス10月17日 。市販のCADシステムは、構築の乱れ18の検出において十分に機能することが見出されている。スクリーニングで発見さや間隔、がん症例3,4,19-22の前にマンモグラムにおける構造的ひずみの検出に関する研究は、その初期段階での乳房疾患の検出および治療 ​​のための戦略の開発に役立つ、との改善につながる可能性患者23の予後。 実験用のイメージの準備実験は、診断された56の個人の106の前にマンモグラムを含む158のマンモグラフィ画像を用いて実施した乳癌および13の正常な個体の52イメージを持つ。研究のための倫理承認はコンジョイント保健研究倫理委員会、医療倫理の事務所、カルガリー大学、カルガリー地域の保健局から入手した。乳がん21,24,25の早期発見のためアルバータプログラム：画像はスクリーン·テストから得られた。 前スクリーニングプログラム外の癌の診断するためのスクリーニングプログラムへの最後の定期的な訪問で取得されたマンモグラムはインターバル癌症例の前にマンモグラムとして標識した。対応する診断マンモグラムは利用できませんでした。 106前マンモグラムの2が、すべてがスクリーニングプログラムでの取得と解析時に乳がんの兆候がないことが宣言されていた、他の2マンモグラムに対応した個人は、生検のために呼ばれていた。癌の診断および従来のマンモグラムの間の時間間隔は、1.5ヶ月の範囲であった15ヶ月と7ヶ月の標準偏差の平均は24.5カ月、S、。データベースで使用可能なインターバル癌症例の前にマンモグラムの全ては、疑わしい部分が特定されない可能性があった6枚の画像を除いて、本研究に含まれています。 スクリーンフィルムマンモグラムを50ミクロンとLumiscan 85レーザスキャナ（Lumisys、カリフォルニア州サニーベール）を使用して、ピクセルあたり12ビットのグレースケールの解像度の空間分解能でデジタル化された。マンモグラフィー（JELD）に特化した専門家の放射線科医が、インターバル癌症例の106前マンモグラムのすべてを見直し、その後の画像や生検で使用可能なレポートに基づいて、長方形のボックスで構造的ひずみの疑いのある領域をマークし、またはマンモグラムの詳細な検査により、 。本研究で使用したデータセットでの106前のマンモグラフィ画像のうち、38の画像が見える構造的ひずみを持っており、残りの68の画像は、疑わしいあるいは全く明らかにEVが含まれている建築の歪みをidentを。放射線科医によって描かれた長方形のボックスで識別されるように、それぞれの前にマンモグラムは構造的ひずみの単一のサイトが含まれています。平均幅、高さ、および放射線科医によってマークされた画像の106疑わしい部分の面積は、それぞれ11.8ミリメートル11.6ミリメートル、および1073.9ミリメートル2の標準偏差が56ミリメートル、39ミリメートル、2274ミリメートルと2である。

detection of architectural distortion in prior mammograms via analysis of oriented patterns

我々は、マンモグラムにおける乳房組織パターンの向きの分析に基づいて間隔癌症例の前にマンモグラムにおける構築の乱れの検出のための方法を実証する。私たちは、建築の歪みが大衆や腫瘍の形成前に、マンモグラフィ画像中の乳房組織パターンの通常の方向を変更すると仮定した。私たちの方法の最初のステップでは、指定されたマンモグラムに配向構造は、組織のパターンを照射するか、交差のノードのようなサイトを検出するために、ガボールフィルタと位相の肖像画を用いて分析する。検出された各サイトは、ノード値、フラクタル次元、具体的には、構造的ひずみに関連したspiculatingパターンを表現するために設計された角度分散の尺度を用いて特徴づけている。 私たちの方法はために開発された機能を使用して、56インターバル癌症例の106前のマンモグラムおよび13の正常例の52マンモグラムのデータベースを用いて試験した建築のゆがみ、二次判別分析によるパターン分類、およびリーブ1患者出手順の検証の特性。自由応答受信者動作特性分析の結果によれば、我々の方法は、従来のマンモグラムにおける構築の乱れを検出する能力を実証した乳癌の臨床診断の前に（平均で）15ヶ月を撮影し、約80％の感度を有する患者あたり5偽陽性。

各特徴は、単独で用いた場合には三つの特徴、すなわち、ノード値、FD、F及びH は 、それぞれ、0.61、0.59、および0.64のAUC値を提供した。 3機能を併用することにより、AUC = 0.70と改善されたパフォーマンスを提供した。三つの特徴の組合せを用いて得られたFROC曲線は、7.5のFP /患者での5.6のFP /患者および89％の80％の感度を示しており、 図11に示されて...

Watch this Scientific Journal Video about Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns at JoVE.com

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

我々は前にマンモグラムの建築の歪みを検出する方法を示しています。配向構造は、組織パターンを照射する部位を検出するために、ガボールフィルタと位相の肖像画を用いて分析する。各サイトには特徴づけられ、spiculatingパターンを表現するための措置を使用して分類されている。方法は、乳癌の検出を支援すべきである。

前にマンモグラムにおける構造的ひずみを検出<em&gt;経由</em指向パターンの&gt;分析

We demonstrate methods for the detection of architectural distortion in prior mammograms of interval-cancer cases based on analysis of the orientation of ...

detection-architectural-distortion-prior-mammograms-via-analysis

Research

JoVE Journal

Medicine

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

42.6K ビュー.  University of Calgary. 我々は前にマンモグラムの建築の歪みを検出する方法を示しています。配向構造は、組織パターンを照射する部位を検出するために、ガボールフィルタと位相の肖像画を用いて分析する。各サイトには特徴づけられ、spiculatingパターンを表現するための措置を使用して分類されている。方法は、乳癌の検出を支援すべきである。 

ビデオ: Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Cerenkov Luminescence Imaging (CLI) for Cancer Therapy Monitoring

In molecular imaging, positron emission tomography (PET) and optical imaging (OI) are two of the most important and thus most widely used modalities1-3. PET is characterized by its excellent sensitivity and quantification ability while OI is notable for non-radiation, relative low cost, short scanning time, high throughput, and wide availability to basic researchers. However, both modalities have their shortcomings as well. PET suffers from poor spatial resolution and high cost, while OI is mostly limited to preclinical applications because of its limited tissue penetration along with prominent scattering optical signals through the thickness of living tissues.
 Recently a bridge between PET and OI has emerged with the discovery of Cerenkov Luminescence Imaging (CLI)4-6. CLI is a new imaging modality that harnesses Cerenkov Radiation (CR) to image radionuclides with OI instruments. Russian Nobel laureate Alekseyevich Cerenkov and his colleagues originally discovered CR in 1934. It is a form of electromagnetic radiation emitted when a charged particle travels at a superluminal speed in a dielectric medium7,8. The charged particle, whether positron or electron, perturbs the electromagnetic field of the medium by displacing the electrons in its atoms. After passing of the disruption photons are emitted as the displaced electrons return to the ground state. For instance, one 18F decay was estimated to produce an average of 3 photons in water5. 
 Since its emergence, CLI has been investigated for its use in a variety of preclinical applications including in vivo tumor imaging, reporter gene imaging, radiotracer development, multimodality imaging, among others4,5,9,10,11. The most important reason why CLI has enjoyed much success so far is that this new technology takes advantage of the low cost and wide availability of OI to image radionuclides, which used to be imaged only by more expensive and less available nuclear imaging modalities such as PET.
 Here, we present the method of using CLI to monitor cancer drug therapy. Our group has recently investigated this new application and validated its feasibility by a proof-of-concept study12. We demonstrated that CLI and PET exhibited excellent correlations across different tumor xenografts and imaging probes. This is consistent with the overarching principle of CR that CLI essentially visualizes the same radionuclides as PET. We selected Bevacizumab (Avastin; Genentech/Roche) as our therapeutic agent because it is a well-known angiogenesis inhibitor13,14. Maturation of this technology in the near future can be envisioned to have a significant impact on preclinical drug development, screening, as well as therapy monitoring of patients receiving treatments.

Cerenkov Luminescence Imaging CLI for Cancer Therapy Monitoring

Use of Cerenkov Luminescence Imaging (CLI) for monitoring preclinical cancer treatment is described here. This method takes advantage of Cerenkov Radiation (CR) and optical imaging (OI) to visualize radiolabeled probes and thus provides an alternative to PET in preclinical therapeutic monitoring and drug screening.

がん治療のモニタリングのためのチェレンコフ発光イメージング（CLI）

In  molecular imaging, positron emission tomography (PET) and optical imaging (OI)  are two of the most important and thus most widely used modalities1-3. ...

医学

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data

The scaled subprofile model (SSM)1-4 is a multivariate PCA-based algorithm that identifies major sources of variation in patient and control group brain image data while rejecting lesser components (Figure 1). Applied directly to voxel-by-voxel covariance data of steady-state multimodality images, an entire group image set can be reduced to a few significant linearly independent covariance patterns and corresponding subject scores. Each pattern, termed a group invariant subprofile (GIS), is an orthogonal principal component that represents a spatially distributed network of functionally interrelated brain regions. Large global mean scalar effects that can obscure smaller network-specific contributions are removed by the inherent logarithmic conversion and mean centering of the data2,5,6. Subjects express each of these patterns to a variable degree represented by a simple scalar score that can correlate with independent clinical or psychometric descriptors7,8. Using logistic regression analysis of subject scores (i.e. pattern expression values), linear coefficients can be derived to combine multiple principal components into single disease-related spatial covariance patterns, i.e. composite networks with improved discrimination of patients from healthy control subjects5,6. Cross-validation within the derivation set can be performed using bootstrap resampling techniques9. Forward validation is easily confirmed by direct score evaluation of the derived patterns in prospective datasets10. Once validated, disease-related patterns can be used to score individual patients with respect to a fixed reference sample, often the set of healthy subjects that was used (with the disease group) in the original pattern derivation11. These standardized values can in turn be used to assist in differential diagnosis12,13 and to assess disease progression and treatment effects at the network level7,14-16. We present an example of the application of this methodology to FDG PET data of Parkinson's Disease patients and normal controls using our in-house software to derive a characteristic covariance pattern biomarker of disease.

Multivariate techniques including principal component analysis (PCA) have been used to identify signature patterns of regional change in functional brain images. We have developed an algorithm to identify reproducible network biomarkers for the diagnosis of neurodegenerative disorders, assessment of disease progression, and objective evaluation of treatment effects in patient populations.

ニューロイメージングデータを用いた疾患関連空間共分散パターンの同定

The scaled subprofile model (SSM)1-4 is a multivariate PCA-based algorithm that identifies major sources of variation in patient and control group brain ...

Collecting Saliva and Measuring Salivary Cortisol and Alpha-amylase in Frail Community Residing Older Adults via Family Caregivers

Salivary measures have emerged in bio-behavioral research that are easy-to-collect, minimally invasive, and relatively inexpensive biologic markers of stress. This article we present the steps for collection and analysis of two salivary assays in research with frail, community residing older adults-salivary cortisol and salivary alpha amylase. The field of salivary bioscience is rapidly advancing and the purpose of this presentation is to provide an update on the developments for investigators interested in integrating these measures into research on aging. Strategies are presented for instructing family caregivers in collecting saliva in the home, and for conducting laboratory analyses of salivary analytes that have demonstrated feasibility, high compliance, and yield quality specimens. The protocol for sample collection includes: (1) consistent use of collection materials; (2) standardized methods that promote adherence and minimize subject burden; and (3) procedures for controlling certain confounding agents. We also provide strategies for laboratory analyses include: (1) saliva handling and processing; (2) salivary cortisol and salivary alpha amylase assay procedures; and (3) analytic considerations.

We demonstrate: (1) procedures for collection of salivary samples in cognitive impaired older adults by family caregivers in the home setting, (2) procedures for measuring stress activity via salivary cortisol and alpha amylase, and (3) representative profiles. Protocols that allow researchers to study stress-linked processes advance our understanding of biological sensitivity and susceptibility.

唾液を収集し、家族介護者を経由して高齢者を居住する虚弱コミュニティ唾液コルチゾールおよびα-アミラーゼの測定

Salivary measures have emerged in bio-behavioral research  that are easy-to-collect, minimally invasive, and relatively inexpensive  biologic markers of ...

Carotid Artery Infusions for Pharmacokinetic and Pharmacodynamic Analysis of Taxanes in Mice

When proposing the use of a drug, drug combination, or drug delivery into a novel system, one must assess the pharmacokinetics of the drug in the study model. As the use of mouse models are often a vital step in preclinical drug discovery and drug development1-8, it is necessary to design a system to introduce drugs into mice in a uniform, reproducible manner. Ideally, the system should permit the collection of blood samples at regular intervals over a set time course. The ability to measure drug concentrations by mass-spectrometry, has allowed investigators to follow the changes in plasma drug levels over time in individual mice1, 9, 10. In this study, paclitaxel was introduced into transgenic mice as a continuous arterial infusion over three hours, while blood samples were simultaneously taken by retro-orbital bleeds at set time points. Carotid artery infusions are a potential alternative to jugular vein infusions, when factors such as mammary tumors or other obstructions make jugular infusions impractical. Using this technique, paclitaxel concentrations in plasma and tissue achieved similar levels as compared to jugular infusion. In this tutorial, we will demonstrate how to successfully catheterize the carotid artery by preparing an optimized catheter for the individual mouse model, then show how to insert and secure the catheter into the mouse carotid artery, thread the end of the catheter out through the back of the mouse&#8217;s neck, and hook the mouse to a pump to deliver a controlled rate of drug influx. Multiple low volume retro-orbital bleeds allow for analysis of plasma drug concentrations over time.

This method was developed with the goal of delivering a steady drug solution via the carotid artery, to assess the pharmacokinetics of novel drugs in mouse models.

マウスにおけるタキサンの薬物動態学的および薬力学的分析のための頸動脈煎茶

When proposing the use of a drug, drug combination, or drug delivery into a novel system, one must assess the pharmacokinetics of the drug in the study ...

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of life and survival of breast cancer patients. In this paper a new approach for the detection of breast cancer is described, based on tracking the mammary architectural elements using diffusion tensor imaging (DTI). 
The paper focuses on the scanning protocols and image processing algorithms and software that were designed to fit the diffusion properties of the mammary fibroglandular tissue and its changes during malignant transformation. The final output yields pixel by pixel vector maps that track the architecture of the entire mammary ductal glandular trees and parametric maps of the diffusion tensor coefficients and anisotropy indices. 
The efficiency of the method to detect breast cancer was tested by scanning women volunteers including 68 patients with breast cancer confirmed by histopathology findings. Regions with cancer cells exhibited a marked reduction in the diffusion coefficients and in the maximal anisotropy index as compared to the normal breast tissue, providing an intrinsic contrast for delineating the boundaries of malignant growth. Overall, the sensitivity of the DTI parameters to detect breast cancer was found to be high, particularly in dense breasts, and comparable to the current standard breast MRI method that requires injection of a contrast agent. Thus, this method offers a completely non-invasive, safe and sensitive tool for breast cancer detection.

We describe how to obtain parametric and vector maps of the diffusion tensor of the breast using magnetic resonance imaging. The protocol and final output following imaging processing are tailored for tracking breast architectural features and detecting breast malignancy.

乳腺アーキテクチャの特長を追跡し、磁気共鳴拡散テンソルイメージングと乳がんの検出

Breast cancer is the most common cause of cancer among women worldwide. Early detection of breast cancer has a critical role in improving the quality of ...

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a serious problem. Therefore, the acceptance criteria for organ donors have been extended leading to the usage of marginal kidney grafts. These marginal organs tolerate cold storage poorly resulting in increased preservation injury and higher rates of delayed graft function. To overcome the limitations of cold storage, extensive research is focused on alternative normothermic preservation methods.
Ex vivo normothermic organ perfusion is an innovative preservation technique. The first experimental and clinical trials for ex vivo lung, liver, and kidney perfusions demonstrated favorable outcomes.
In addition to the reduction of cold ischemic injury, the method of normothermic kidney storage offers the opportunity for organ assessment and repair. This manuscript provides information about kidney retrieval, organ preservation techniques, and isolated ex vivo normothermic kidney perfusion (NEVKP) in a porcine model. Surgical techniques, set up for the perfusion solution and the circuit, potential assessment options, and representative results are demonstrated.

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

The severe organ shortage has resulted in increased use of marginal kidney grafts for transplantation. This has triggered interest in alternative storage methods, since marginal grafts especially tolerate cold storage poorly. The technique of normothermic ex vivo kidney perfusion (NEVKP) represents a novel preservation method for kidney grafts prior to &#160;transplantation.

正常温度の<em&gt;エクスビボ</em&gt;腎臓の保全のための腎臓の灌流は移植前の移植片

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a ...

VDJ-Seq: Deep Sequencing Analysis of Rearranged Immunoglobulin Heavy Chain Gene to Reveal Clonal Evolution Patterns of B Cell Lymphoma

Understanding tumor clonality is critical to understanding the mechanisms involved in tumorigenesis and disease progression. In addition, understanding the clonal composition changes that occur within a tumor in response to certain micro-environment or treatments may lead to the design of more sophisticated and effective approaches to eradicate tumor cells. However, tracking tumor clonal sub-populations has been challenging due to the lack of distinguishable markers. To address this problem, a VDJ-seq protocol was created to trace the clonal evolution patterns of diffuse large B cell lymphoma (DLBCL) relapse by exploiting VDJ recombination and somatic hypermutation (SHM), two unique features of B cell lymphomas.
In this protocol, Next-Generation sequencing (NGS) libraries with indexing potential were constructed from amplified rearranged immunoglobulin heavy chain (IgH) VDJ region from pairs of primary diagnosis and relapse DLBCL samples. On average more than half million VDJ sequences per sample were obtained after sequencing, which contain both VDJ rearrangement and SHM information. In addition, customized bioinformatics pipelines were developed to fully utilize sequence information for the characterization of IgH-VDJ repertoire within these samples. Furthermore, the pipeline allows the reconstruction and comparison of the clonal architecture of individual tumors, which enables the examination of the clonal heterogeneity within the diagnosis tumors and deduction of clonal evolution patterns between diagnosis and relapse tumor pairs. When applying this analysis to several diagnosis-relapse pairs, we uncovered key evidence that multiple distinctive tumor evolutionary patterns could lead to DLBCL relapse. Additionally, this approach can be expanded into other clinical aspects, such as identification of minimal residual disease, monitoring relapse progress and treatment response, and investigation of immune repertoires in non-lymphoma contexts.

This protocol describes an approach to interrogate the recombined immunoglobulin heavy chain VDJ regions of lymphomas by deep-sequencing and retrieve VDJ rearrangement and somatic hypermutation status to delineate clonal architecture of individual tumor. Comparing clonal architecture between paired diagnosis and relapse samples reveals lymphoma relapse clonal evolution modes.

VDJ-のSeq：B細胞リンパ腫のクローン進化のパターンを明らかに転位免疫グロブリン重鎖遺伝子のディープシーケンシング解析

Understanding tumor clonality is critical to understanding the mechanisms involved in tumorigenesis and disease progression. In addition, understanding ...

Depletion of Mouse Cells from Human Tumor Xenografts Significantly Improves Downstream Analysis of Target Cells

The use of in vitro cell line models for cancer research has been a useful tool. However, it has been shown that these models fail to reliably mimic patient tumors in different assays1. Human tumor xenografts represent the gold standard with respect to tumor biology, drug discovery, and metastasis research 2-4. Tumor xenografts can be derived from different types of material like tumor cell lines, tumor tissue from primary patient tumors4 or serially transplanted tumors. When propagated in vivo, xenografted tissue is infiltrated and vascularized by cells of mouse origin. Multiple factors such as the tumor entity, the origin of xenografted material, growth rate and region of transplantation influence the composition and the amount of mouse cells present in tumor xenografts. However, even when these factors are kept constant, the degree of mouse cell contamination is highly variable.
Contaminating mouse cells significantly impair downstream analyses of human tumor xenografts. As mouse fibroblasts show high plating efficacies and proliferation rates, they tend to overgrow cultures of human tumor cells, especially slowly proliferating subpopulations. Mouse cell derived DNA, mRNA, and protein components can bias downstream gene expression analysis, next-generation sequencing, as well as proteome analysis 5. To overcome these limitations, we have developed a fast and easy method to isolate untouched human tumor cells from xenografted tumor tissue. This procedure is based on the comprehensive depletion of cells of mouse origin by combining automated tissue dissociation with the benchtop tissue dissociator and magnetic cell sorting. Here, we demonstrate that human target cells can be can be obtained with purities higher than 96% within less than 20 min independent of the tumor type.

Human tumor xenografts are vascularized and infiltrated by cells of mouse origin during the growth phase in vivo. To circumvent the bias caused by these contaminating cells during downstream analysis, we developed a method allowing for comprehensive depletion of all mouse cells by magnetic cell sorting.

ヒト腫瘍異種移植片からマウス細胞の枯渇は大幅に標的細胞の下流分析を向上させます

The use of in vitro cell line models for cancer research has been a useful tool. However, it has been shown that these models fail to reliably mimic ...

Re-Arterialized Rat Partial Liver Transplantation with an in vivo Vessel-Oriented 70% Hepatectomy

Split liver transplantation and living liver donor liver transplantation were developed in the clinic to utilize liver organs in a more efficient manner. To better understand the mechanism behind these surgical procedures, a rat partial liver transplantation (PLTx) model was established for relevant surgical studies. Because of the complexity of the rat PLTx model, a protocol with detailed descriptions is required. An article published previously reported a protocol in which ex vivo hepatectomy was used to achieve 50% rat PLTx. In contrast to this protocol, we introduced a re-arterialized PLTx with an in vivo 70% hepatectomy. An updated vessel-oriented hepatectomy was incorporated into the rat PLTx to refine the microsurgical procedure. The portal veins and hepatic arteries of the left lateral lobe and the median lobe were individually dissected and ligated before removal of the liver parenchyma, thereby decreasing the probability of bleeding in the remnant liver stump. Furthermore, an end-to-side vessel anastomosis between the common hepatic artery and the enlarged proper hepatic artery was introduced to re-arterialize the hepatic artery. By using this end-to-side vessel anastomosis technique, the diameter of the anastomosis was enlarged, thereby decreasing the difficulty of hand suture and maintaining a high rate of anastomotic patency. Moreover, the cuff anastomosis of the infrahepatic vena cava was slightly modified. A section of circumferential liver parenchyma around the vena cava of a recipient was preserved during cuff anastomosis to maintain the three-dimensional shape of the vascular lumen. This section of liver parenchyma was removed after completing the anastomosis. With this modification, the step involving placement of stay sutures was omitted, thereby further shortening the cuff anastomosis time. By using this protocol of rat PLTx, a low liver enzyme level, an intact liver lobular architecture and a high survival rate were achieved after microsurgery.

Re-Arterialized Rat Partial Liver Transplantation with an in vivo Vessel-Oriented 70% Hepatectomy

Here, a protocol involving re-arterialized rat partial liver transplantation is presented. Specifically, 70% liver was resected in vivo by using an updated technique of vessel-oriented hepatectomy. The hepatic artery was reconstructed in an end-to-side manner. The cuff technique was modified to shorten the anastomosis time of the infrahepatic vena cava.

再門脈部分肝移植のラット体内血管指向 70% 肝切除

Split liver transplantation and living liver donor liver transplantation were developed in the clinic to utilize liver organs in a more efficient manner. ...

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand

A robot-assisted hand is used for the rehabilitation of patients with impaired upper limb function, particularly for stroke patients with a loss of motor control. However, it is unclear how conventional occupational training strategies can be applied to the use of rehabilitation robots. Novel robotic technologies and occupational therapy concepts are used to develop a protocol that allows patients with impaired upper limb function to grasp objects using their affected hand through a variety of pinching and grasping functions. To conduct this appropriately, we used five types of objects: a peg, a rectangular cube, a cube, a ball, and a cylindrical bar. We also equipped the patients with a robotic hand, the Mirror Hand, an exoskeleton&#160;hand that is fitted to the subject&#8217;s affected hand and follows the movement of the sensor glove fitted to their unaffected hand (bimanual movement training (BMT)). This study had two stages. Three healthy subjects were first recruited to test the feasibility and acceptability of the training program. Three patients with hand dysfunction caused by stroke were then recruited to confirm the feasibility and acceptability of the training program, which was conducted on 3 consecutive days. On each day, the patient was monitored during 5 min of movement in a passive range of motion, 5 min of robot-assisted bimanual movement, and task-oriented training using the five objects. The results showed that both healthy subjects and subjects who had suffered a stroke in conjunction with the robotic hand could successfully grasp the objects. Both healthy subjects and those who had suffered a stroke performed well with the robot-assisted task-oriented training program in terms of feasibility and acceptability.

This study reports the development of a novel robot-assisted task-oriented program for hand rehabilitation. The developmental process consists of experiments using both healthy subjects and subjects who have had a stroke and suffered from subsequent motor control dysfunction.

バイマニュアル外骨格ロボットハンドを用いた新規タスク指向リハビリテーションプログラムの開発

A robot-assisted hand is used for the rehabilitation of patients with impaired upper limb function, particularly for stroke patients with a loss of motor ...