The platform for open and practice-oriented research

product

Calibration and validation of kv-CBCT in room imaging for dose calculation and adaptive radiotherapy

Op verzoek van Jelle Scheurleer: Purpose: To investigate the accuracy of dose calculation on cone beam CT (CBCT) data sets after HU-RED calibration and validation in phantom studies and clinical patients. Material and methods: Calibration of HU-RED curves for kV-CBCT were generated for three clinical protocols (H&N, thorax and pelvis) by using a Gammex RMI phantom with human tissue equivalent inserts and additional perspex blocks to account for patient scatter. Two calibration curves per clinical protocol were defined, one for the Varian Truebeam 2.0 and another for the OBI systems (Varian, Palo Ato). Differences in HU values with respect to the CT-calibration curve were evaluated for all the inserts. Four radiotherapy plans (breast, prostate, H&N and lung) were produced on an anthropomorphic phantom (Alderson) to evaluate dose differences on the kV-CBCT with the new calibration curves with respect to the CT based dose calculation. Dose differences were evaluated according to the D2%, D98% and Dmean metrics extracted from the DVHs of the plans and - evaluation (2%, 1mm) on the three planes at the isocenter for all plans. Clinical evaluation was performed on 5 patients and dose differences were evaluated as in the phantom study.

DOCUMENT

Calibration and validation of kv-CBCT in room imaging for dose calculation and adaptive radiotherapy

product

Can Students Create Their Own Educational Escape Room?

Abstract Educational escape rooms (EERs) are live-action, team-based games used to teach content-related and generic knowledge and skills. Instead of students just playing the EER, we believed that giving them the opportunity to create their own EERs would augment the learning efects of this teaching method. We report on the feasibility, evaluation, and lessons learned of our assignment on an opioid epidemic-based EER. This original teaching method appealed to most students, but the workload was evaluated to be too high. Our lessons learned include the need for sufcient (extrinsic) motivation, careful explanation of the assignment, and small group sizes.

MULTIFILE

Can Students Create Their Own Educational Escape Room?

product

Digital imaging and radiographic practise in diagnostic radiography

Abstract gepubliceerd in Elsevier: Introduction: Recent research has identified the issue of ‘dose creep’ in diagnostic radiography and claims it is due to the introduction of CR and DR technology. More recently radiographers have reported that they do not regularly manipulate exposure factors for different sized patients and rely on pre-set exposures. The aim of the study was to identify any variation in knowledge and radiographic practice across Europe when imaging the chest, abdomen and pelvis using digital imaging. Methods: A random selection of 50% of educational institutes (n ¼ 17) which were affiliated members of the European Federation of Radiographer Societies (EFRS) were contacted via their contact details supplied on the EFRS website. Each of these institutes identified appropriate radiographic staff in their clinical network to complete an online survey via SurveyMonkey. Data was collected on exposures used for 3 common x-ray examinations using CR/DR, range of equipment in use, staff educational training and awareness of DRL. Descriptive statistics were performed with the aid of Excel and SPSS version 21. Results: A response rate of 70% was achieved from the affiliated educational members of EFRS and a rate of 55% from the individual hospitals in 12 countries across Europe. Variation was identified in practice when imaging the chest, abdomen and pelvis using both CR and DR digital systems. There is wide variation in radiographer training/education across countries.

DOCUMENT

Digital imaging and radiographic practise in diagnostic radiography

product

Motion nature projection reduces patient's psycho-physiological anxiety during CT imaging.

A growing body of evidence indicates that natural environments can positively influence people. This study investigated whether the use of motion nature projection in computed tomography (CT) imaging rooms is effective in mitigating psycho-physiological anxiety (vs. no intervention) using a quasirandomized experiment (N ¼ 97). Perceived anxiety and pleasantness of the room were measured using a questionnaire, and physiological arousal was measured using a patient monitor system. A mediation analysis showed that motion nature projection had a negative indirect effect on perceived anxietythrough a higher level of perceived pleasantness of the room. A linear-mixed-model showed that heart rate and diastolic blood pressure were lower when motion nature was projected. In conclusion, by creating a more pleasant imaging room through motion nature projection, hospitals can indirectly reduce patient's psycho-physiological anxiety (vs. no image projection) during a CT scan.

LINK

product

Gas sensing performance at room temperature of nanogap interdigitated electrodes for detection of acetone at low concentration

From the article: "A facile approach for the fabrication of large-scale interdigitated nanogap electrodes (nanogap IDEs) with a controllable gap was demonstrated with conventional micro-fabrication technology to develop chemocapacitors for gas sensing applications. In this work, interdigitated nanogap electrodes (nanogap IDEs) with gaps from 50–250 nm have been designed and processed at full wafer-scale. These nanogap IDEs were then coated with poly(4-vinyl phenol) as a sensitive layer to form gas sensors for acetone detection at low concentrations. These acetone sensors showed excellent sensing performance with a dynamic range from 1000 ppm to 10 ppm of acetone at room temperature and the observed results are compared with conventional interdigitated microelectrodes according to our previous work. Sensitivity and reproducibility of devices are discussed in detail. Our approach of fabrication of nanogap IDEs together with a simple coating method to apply the sensing layer opens up possibilities to create various nanogap devices in a cost-effective manner for gas sensing applications"

MULTIFILE

Gas sensing performance at room temperature of nanogap interdigitated electrodes for detection of acetone at low concentration

product

Timing of surgery in acute deep partial-thickness burns

For deep partial-thickness burns no consensus on the optimal treatment has been reached due to conflicting study outcomes with low quality evidence. Treatment options in high- and middle-income countries include conservative treatment with delayed excision and grafting if needed; and early excision and grafting. The majority of timing of surgery studies focus on survival rather than on quality of life. This study protocol describes a study that aims to compare long-term scar quality, clinical outcomes, and patient-reported outcomes between the treatment options. A multicentre prospective study will be conducted in the three Dutch burn centres (Rotterdam, Beverwijk, and Groningen). All adult patients with acute deep-partial thickness burns, based on healing potential with Laser Doppler Imaging, are eligible for inclusion. During a nine-month baseline period, standard practice will be monitored. This includes conservative treatment with dressings and topical agents, and excision and grafting of residual defects if needed 14–21 days post-burn. The subsequent nine months, early surgery is advocated, involving excision and grafting in the first week to ten days post-burn. The primary outcome compared between the two groups is long-term scar quality assessed by the Patient and Observer Scar Assessment Scale 3.0 twelve months after discharge. Secondary outcomes include clinical outcomes and patient-reported outcomes like quality of life and return to work. The aim of the study is to assess long-term scar quality in deep partial-thickness burns after conservative treatment with delayed excision and grafting if needed, compared to early excision and grafting. Adding to the ongoing debate on the optimal treatment of these burns. The broad range of studied outcomes will be used for the development of a decision aid for deep partial-thickness burns, to fully inform patients at the point of consent to surgery and support optimal person-centred care.

DOCUMENT

Timing of surgery in acute deep partial-thickness burns

product

Attending the Dying: Images of Compassion

Reading a novel about a dying person and the people attending the dying, one can not only reflect upon the moral involvement between the literary characters depicted, but also upon the way in which the reader takes the position of a “bystander” in this scene. In two novels, The Death of Ivan Ilyich by Tolstoy and The Big Ward by the Dutch author Jacoba van Velde, this moral involvement can be interpreted as a form of “compassion”. Martha Nussbaum’s concept of “compassionate imagination” offers a perspective on the way in which the reader can be involved in this literary depiction of the dying. However, the Aristotelian criteria that Nussbaum proposes for the rational judgement of compassion and her ambitions that literature can “raise society’s floor” by developing “compassionate imagination” in readers, are difficult to apply to these specific cases. In comparing both novels, it is exactly the differences between them – the historical context and social classes depicted - that bring to light a problematic presupposition in Nussbaum, namely the a-historical universality in the compassionate involvement. A re-interpretation of one of the Aristotelian criteria for compassion leaves room for a “compassionate imagination” not based on a rational judgement but on a sense of shared vulnerability that is precisely evoked by the literary depiction of the dying.

LINK

product

Learning and Teaching in Uncertain Times

Today professionals have to deal with more uncertainties in their field than before. We live in complex and rapidly changing environments. The British philosopher Ronald Barnett adds the term ‘supercomplexity’ to highlight the fact that ‘we can no longer be sure how even to describe the world that faces us’ (Barnett, 2004). Uncertainty is, nevertheless, not a highly appreciated notion. An obvious response to uncertainty is to reduce it– or even better, to wipe it away. The assumption of this approach is that uncertainty has no advantages. This assumption is, however, not correct as several contemporary authors have argued. Rather than problematising uncertainty, I will investigate the pros and cons of embedding uncertainty in educational practice of professional higher education. In order to thoroughly explore the probabilities and challenges that uncertainty poses in education, I will dwell on the radical ideas on uncertainty of the German philosopher Friedrich Nietzsche. In The Birth of Tragedy (1872) he recognizes two forces: the Apollinian, that is the pursuit of order and coherence, and the Dionysian, that is the human tendency to nullify all systematization and idealisation. Uncertainty is part of the Dionysian. I will argue that when educators take Nietzsche’s plea to make room for the Dionysian to heart, they can better prepare students for an uncertain world. If and only if students are encouraged to deploy both tendencies – the Apollinian and the Dionysian – they can become professionals who are able to stand their ground in an uncertain and changing (professional) world. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. https://doi.org/10.1111/1467-9752.12038

MULTIFILE

Learning and Teaching in Uncertain Times

product

I’M A.I. IMage Processing and Artificial Intelligence [Inaugurele rede]

Brochure from the Inauguration of Klaas Dijkstra, professor Computer Vision and Data Science

DOCUMENT

Search results

Products 415

Calibration and validation of kv-CBCT in room imaging for dose calculation and adaptive radiotherapy

Can Students Create Their Own Educational Escape Room?

Digital imaging and radiographic practise in diagnostic radiography

Motion nature projection reduces patient's psycho-physiological anxiety during CT imaging.

Gas sensing performance at room temperature of nanogap interdigitated electrodes for detection of acetone at low concentration

Timing of surgery in acute deep partial-thickness burns

Attending the Dying: Images of Compassion

Learning and Teaching in Uncertain Times

I’M A.I. IMage Processing and Artificial Intelligence [Inaugurele rede]

Projects 1

RAAK PRO Hyperspectral Imaging of Textiles

Navigate to

Categories

Filters

Products 415

Calibration and validation of kv-CBCT in room imaging for dose calculation and adaptive radiotherapy

Can Students Create Their Own Educational Escape Room?

Digital imaging and radiographic practise in diagnostic radiography

Motion nature projection reduces patient's psycho-physiological anxiety during CT imaging.

Gas sensing performance at room temperature of nanogap interdigitated electrodes for detection of acetone at low concentration

Timing of surgery in acute deep partial-thickness burns

Attending the Dying: Images of Compassion

Learning and Teaching in Uncertain Times

I’M A.I. IMage Processing and Artificial Intelligence [Inaugurele rede]

Projects 1

RAAK PRO Hyperspectral Imaging of Textiles