You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Touchless computer interfaces in hospitals: A review 
Chapter Title:  observe that 
1. Abstract of Cited Paper (BIB001):  Whether attempting to review digital radiologic images during a procedure or reviewing labs on a clinical ward, computer keyboards and mice are potential sources for contamination of clinicians during sterile and non-sterile activities related to clinical care. The authors describe and demonstrate a live system prototype for hands-free, gesture-based control of an electronic medical record (EMR) system. 
2. Abstract of Cited Paper (BIB002):  The use of doctor-computer interaction devices in the operation room (OR) requires new modalities that support medical imaging manipulation while allowing doctors' hands to remain sterile, supporting their focus of attention, and providing fast response times. This paper presents "Gestix," a vision-based hand gesture capture and recognition system that interprets in real-time the user's gestures for navigation and manipulation of images in an electronic medical record (EMR) database. Navigation and other gestures are translated to commands based on their temporal trajectories, through video capture. "Gestix" was tested during a brain biopsy procedure. In the in vivo experiment, this interface prevented the surgeon's focus shift and change of location while achieving a rapid intuitive reaction and easy interaction. Data from two usability tests provide insights and implications regarding human-computer interaction based on nonverbal conversational modalities. 
3. Abstract of Cited Paper (BIB003):  In this paper, an open-source system for a controller-free, highly interactive exploration of medical images is presented. By using a Microsoft Xbox Kinect™ as the only input device, the system's user interface allows users to interact at a distance through hand and arm gestures. The paper also details the interaction techniques we have designed specifically for the deviceless exploration of medical imaging data. Since the user interface is touch-free and does not require complex calibration steps, it is suitable for use in operating rooms, where non-sterilizable devices cannot be used. 
4. Abstract of Cited Paper (BIB004):  Purpose ::: In the operating room (OR) a touchless interface is an ideal solution since it does not demand any physical contact and still can provide the necessary control features in a cleansed and sterilized environment. 
5. Abstract of Cited Paper (BIB005):  Keyboards, mice, and touch screens are a potential source of infection or contamination in operating rooms, intensive care units, and autopsy suites. The authors present a low-cost prototype of a system, which allows for touch-free control of a medical image viewer. This touch-free navigation system consists of a computer system (IMac, OS X 10.6 Apple, USA) with a medical image viewer (OsiriX, OsiriX foundation, Switzerland) and a depth camera (Kinect, Microsoft, USA). They implemented software that translates the data delivered by the camera and a voice recognition software into keyboard and mouse commands, which are then passed to OsiriX. In this feasibility study, the authors introduced 10 medical professionals to the system and asked them to re-create 12 images from a CT data set. They evaluated response times and usability of the system compared with standard mouse/keyboard control. Users felt comfortable with the system after approximately 10 minutes. Response time was 120 ms. Users required 1.4 times more time to re-create an image with gesture control. Users with OsiriX experience were significantly faster using the mouse/keyboard and faster than users without prior experience. They rated the system 3.4 out of 5 for ease of use in comparison to the mouse/keyboard. The touch-free, gesture-controlled system performs favorably and removes a potential vector for infection, protecting both patients and staff. Because the camera can be quickly and easily integrated into existing systems, requires no calibration, and is low cost, the barriers to using this technology are low. 
6. Abstract of Cited Paper (BIB006):  Computerized medical systems play a vital role in the operating room, however, sterility requirements and interventional workflow often make interaction with these devices challenging for surgeons. Typical solutions, such as delegating physical control of keyboard and mouse to assistants, add an undesirable level of indirection. We present a touchless, gesture-based interaction framework for the operating room that lets surgeons define a personalized set of gestures for controlling arbitrary medical computerized systems. Instead of using cameras for capturing gestures, we rely on a few wireless inertial sensors, placed on the arms of the surgeon, eliminating the dependence on illumination and line-of-sight. A discriminative gesture recognition approach based on kernel regression allows us to simultaneously classify performed gestures and to track the relative spatial pose within each gesture, giving surgeons fine-grained control of continuous parameters. An extensible software architecture enables a dynamic association of learned gestures to arbitrary intraoperative computerized systems. Our experiments illustrate the performance of our approach and encourage its practical applicability. 
7. Abstract of Cited Paper (BIB007):  Background ::: Current surgical robots are controlled by a mechanical master located away from the patient, tracking surgeon’s hands by wire and pulleys or mechanical linkage. Contactless hand tracking for surgical robot control is an attractive alternative, because it can be executed with minimal footprint at the patient’s bedside without impairing sterility, while eliminating current disassociation between surgeon and patient. We compared technical and technologic feasibility of contactless hand tracking to the current clinical standard master controllers. 
8. Abstract of Cited Paper (BIB008):  Review of prior and real-time patient images is critical during an interventional radiology procedure; however, it often poses the challenge of efficiently reviewing images while maintaining a sterile field. Although interventional radiologists can "scrub out" of the procedure, use sterile console covers, or verbally relay directions to an assistant, the ability of the interventionalist to directly control the images without having to touch the console could offer potential gains in terms of sterility, procedure efficiency, and radiation reduction. The authors investigated a potential solution with a low-cost, touch-free motion-tracking device that was originally designed as a video game controller. The device tracks a person's skeletal frame and its motions, a capacity that was adapted to allow manipulation of medical images by means of hand gestures. A custom software program called the Touchless Radiology Imaging Control System translates motion information obtained with the motion-tracking device into commands to review images on a workstation. To evaluate this system, 29 radiologists at the authors' institution were asked to perform a set of standardized tasks during a routine abdominal computed tomographic study. Participants evaluated the device for its efficacy as well as its possible advantages and disadvantages. The majority (69%) of those surveyed believed that the device could be useful in an interventional radiology practice and did not foresee problems with maintaining a sterile field. This proof-of-concept prototype and study demonstrate the potential utility of the motion-tracking device for enhancing imaging-guided treatment in the interventional radiology suite while maintaining a sterile field. Supplemental material available at http://radiographics.rsna.org/lookup/suppl/doi:10.1148/rg.332125101/-/DC1. 
9. Abstract of Cited Paper (BIB009):  This paper presents a method to improve the navigation and manipulation of radiological images through a sterile hand gesture recognition interface based on attentional contextual cues. Computer vision algorithms were developed to extract intention and attention cues from the surgeon's behavior and combine them with sensory data from a commodity depth camera. The developed interface was tested in a usability experiment to assess the effectiveness of the new interface. An image navigation and manipulation task was performed, and the gesture recognition accuracy, false positives and task completion times were computed to evaluate system performance. Experimental results show that gesture interaction and surgeon behavior analysis can be used to accurately navigate, manipulate and access MRI images, and therefore this modality could replace the use of keyboard and mice-based interfaces. 
10. Abstract of Cited Paper (BIB010):  During the last few years, we have been witnessing a widespread adoption of touchless technologies in the context of surgical procedures. Touchless interfaces are advantageous in that they can preserve sterility around the patient, allowing surgeons to visualize medical images without having to physically touch any control or to rely on a proxy. Such interfaces have been tailored to interact with 2D medical images but not with 3D reconstructions of anatomical data, since such an interaction requires at least three degrees of freedom. In this paper, we discuss the results of a user study in which a mouse-based interface has been compared with two Kinect-based touchless interfaces which allow users to interact with 3D data with up to nine degrees of freedom. The experimental results show that there is a significant relation between the number of degrees of freedom simultaneously controlled by the user and the number of degrees of freedom required to perform, in a touchless way, an accurate manipulation task. 
11. Abstract of Cited Paper (BIB011):  Sterility restrictions in surgical settings make touch-less interaction an interesting solution for surgeons to interact directly with digital images. The HCI community has already explored several methods for touch-less interaction including those based on camera-based gesture tracking and voice control. In this paper, we present a system for gesture-based interaction with medical images based on a single wristband sensor and capacitive floor sensors, allowing for hand and foot gesture input. The first limited evaluation of the system showed an acceptable level of accuracy for 12 different hand & foot gestures; also users found that our combined hand and foot based gestures are intuitive for providing input. 
12. Abstract of Cited Paper (BIB012):  We adapted and evaluated the Microsoft Kinect (touchless interface), Hillcrest Labs Loop Pointer (gyroscopic mouse), and the Apple iPad (multi-touch tablet) for intra-procedural imaging review efficacy in a simulation using MIM Software DICOM viewers. Using each device, 29 radiologists executed five basic interactions to complete the overall task of measuring an 8.1-cm hepatic lesion: scroll, window, zoom, pan, and measure. For each interaction, participants assessed the devices on a 3-point subjective scale (3 = highest usability score). The five individual scores were summed to calculate a subjective composite usability score (max 15 points). Overall task time to completion was recorded. Each user also assessed each device for its potential to jeopardize a sterile field. The composite usability scores were as follows: Kinect 9.9 (out of 15.0; SD = 2.8), Loop Pointer 12.9 (SD = 13.5), and iPad 13.5 (SD = 1.8). Mean task completion times were as follows: Kinect 156.7 s (SD = 86.5), Loop Pointer 51.5 s (SD = 30.6), and iPad 41.1 s (SD = 25.3). The mean hepatic lesion measurements were as follows: Kinect was 7.3 cm (SD = 0.9), Loop Pointer 7.8 cm (SD = 1.1), and iPad 8.2 cm (SD = 1.2). The mean deviations from true hepatic lesion measurement were as follows: Kinect 1.0 cm and for both the Loop Pointer and iPad, 0.9 cm (SD = 0.7). The Kinect had the least and iPad had the most subjective concern for compromising the sterile field. A new intra-operative imaging review interface may be near. Most surveyed foresee these devices as useful in procedures, and most do not anticipate problems with a sterile field. An ideal device would combine iPad’s usability and accuracy with the Kinect’s touchless aspect. 
13. Abstract of Cited Paper (BIB013):  Purpose: The purposes of this study were to develop a workstation computer that allowed intraoperative touchless control of diagnostic and surgical images by a surgeon, and to report the preliminary experience with the use of the system in a series of cases in which dental surgery was performed. Materials and Methods: A custom workstation with a new motion sensing input device (Leap Motion) was set up in order to use a natural user interface (NUI) to manipulate the imaging software by hand gestures. The system allowed intraoperative touchless control of the surgical images. Results: For the first time in the literature, an NUI system was used for a pilot study during 11 dental surgery procedures including tooth extractions, dental implant placements, and guided bone regeneration. No complications were reported. The system performed very well and was very useful. Conclusion: The proposed system fulfilled the objective of providing touchless access and control of the system of images and a three-dimensional surgical plan, thus allowing the maintenance of sterile conditions. The interaction between surgical staff, under sterile conditions, and computer equipment has been a key issue. The solution with an NUI with touchless control of the images seems to be closer to an ideal. The cost of the sensor system is quite low; this could facilitate its incorporation into the practice of routine dental surgery. This technology has enormous potential in dental surgery and other healthcare specialties. (Imaging Sci Dent 2014; 44: 155-60)

Literature Review:
the important point that we want to make here is not that these systems simply allow quicker ways of doing the same activities that would otherwise be performed. Rather, by overcoming these aspects of existing imaging practices, we lower the barriers to image manipulation such that they can and will be incorporated in new ways in surgical practices. Currently, significant barriers exist to the usage of technology in sterile environments: 'In current practice, therefore, the use of modern technology in the OR is at best awkward and fails to realise its full potential for contributing to the best possible surgical outcomes'.  Context of use OR. As it stands the single most frequently considered use case for such touchless control has been in the OR (mentioned in 32 papers) during surgical procedures, notably for the purpose of providing control of medical image systems such as Picture Archiving and Communications (PAC) systems based on the DICOM standard. In total, 10 papers discuss PAC /DICOM in the OR context. Kim et al. BIB008 found that it is feasible to manipulate surgical tools and execute simple surgical tasks, such as controlling OR lights, imaging data or positioning operating booms, using current commercially available contactless tracking technology, such as the Microsoft Kinect. Interventional radiology. Interventional radiology was discussed as a context of use in 11 papers, making it the second most considered use case for touchless control. Image interaction in interventional radiology takes place within a surgical context rather than a purely diagnostic context, which makes sterility a key requirement.  Tasks. Table 3 lists the tasks and user groups for evaluations where this has been specified. As can be seen, the most common system application for touchless, gesture-driven interfaces has been various forms of image navigation, closely aligned with the OR and interventional radiology contexts listed above. Medical image navigation is the goal in seventeen papers, BIB009 BIB003 BIB002 BIB010   BIB011  BIB004 BIB013  BIB005 BIB006 BIB007 BIB012 BIB001 BIB014 with the more specific subset of magnetic resonance imaging (MRI) image navigation being the goal in six papers. BIB003 BIB010    BIB004 Task context was also significant in identifying tasks for testing the systems implemented, such as measuring a lesion on MRI images. BIB013 Context-sensitive systems. A context-sensitive system is a system that is affected by or reacts to the context it appears in. While the term 'context-sensitive systems' was not found in the corpus, the concept of context was found in five of the papers. Several papers investigated the relationship between context and system functionality. Contextual information, such as focus of attention, can be employed to improve recognition performance. BIB010 Another method for improving recognition accuracy is switching between vocabularies of gestures based on context as suggested by Wachs et al.  This approach could improve performance in gesture-recognition systems, as separate gesture-recognition algorithms are used for smaller gesture subsets. For touchless interaction systems, there are a number of contextual cues that should be considered, both on a situational and an individual level. On a situational level, for example, in the OR, there are specific activities that a surgeon can be expected to be engaged in, such as focusing on the patient and the key image, as well as staying close to the patient. 5