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Definitions

• the present invention relates to a method and system for image analysis of a medical image, a computer program and a method and device for providing annotations of a medical image.
• Medical imaging has undergone major advancements. It is a non-invasive technique used to gather visual representations of the interior of a body for clinical analysis and medical intervention. Medical imaging is furthermore used to gather visual representations concerning the functions of organs and tissues. It seeks to reveal internal structures hidden by the skin and bones, as well as to diagnose and treat diseases.
• Medical imaging refers both to conventional images as well as to moving images, i.e. videos, to two-dimensional images, but also to three-dimensional ones.
• Medical imaging techniques comprise, for example, x-ray imaging, especially computed tomography imaging, ultrasound imaging and magnetic resonance imaging.
• medical imaging is generally equated to radiology and the medical practitioner responsible for acquiring and interpreting the images is a radiologist.
• Reliable imaging is of paramount importance for a radiologist ' s decision making and can reduce unnecessary procedures. Surgical interventions, for example, may be avoided altogether if diagnostic imaging services such as x-ray imaging are available.
• a method for image analysis of a medical image which comprises
• second ROI information indicating a second ROI within said medical image and viewing data including display data and/or viewing time with which the second ROI has been displayed on a display and based on which the second annotations have been made
• a first input unit configured to receive a medical image, first annotations of said medical image and first region of interest, ROI, information indicating a first ROI within said medical image,
• a second input unit configured to receive second annotations of said medical image, second ROI information indicating a second ROI within said medical image and viewing data including display data and/or viewing time with which the second ROI has been displayed on a display and based on which the second annotations have been made, and
• a quality check unit configured to check the quality of the second annotations by comparing the second ROI information to the first ROI information and to check the viewing data.
• a computer program which comprises program code means to carry out the steps of the method for image analysis when said computer program is carried out on the computer as well as a non- transitory computer-readable recording medium that stores therein a computer program product, which, when executed by a processor, causes the method disclosed herein to be performed.
• the present invention is based on the idea to assure due diligence of a medical diagnosis based on analysis of a medical image.
• the method for image analysis according to the present invention may solve these problems.
• said method assures that a radiologist ' s diagnosis based on the analysis of a medical image on a display has been assessed carefully and correctly.
• the ROI it is essential that the correct region of an image, the ROI, is brought in the viewport of the current reader's displaying device. Only then the previous reader ' s annotations can be understood correctly.
• a medical image may need to be displayed according to viewing data transmitted from the previous reader. Otherwise the likelihood of detecting a lesion or other medical anomaly is at best suboptimal.
• checking the viewing data comprises checking if the viewing data meet a viewing data requirement.
• a viewing data requirement In order to check the quality of a reader ' s diagnosis it has to be checked not only whether he/she has selected the ROI as found by a previous or parallel reader but also whether his/her viewing data meet a viewing data requirement. Said requirement is usually specified by the previous or parallel reader.
• viewing data requirements may also be determined automatically by a computer program analyzing the image.
• the viewing data may further include zoom level and/or panning level.
• the display data may further include resolution and/or display size and/or the number of pixels in the screen and/or in the second ROI. That is, it is precisely monitored how a radiologist displays a medical image on his/her displaying device. Furthermore, the kind of display used is analyzed. It may, for example, be recorded that for the first 5 seconds of displaying only the upper half of the image is viewed and that the display used has a diagonal of 13 inches and a 1280 x 800 resolution and the ROI covered 1000 pixels.
• the viewing data requirement comprises a viewing time threshold and/or a zoom level threshold and/or a panning level threshold and/or a resolution threshold and/or a number of pixel threshold and/or a display size threshold.
• a radiologist viewing an image only superficially is not very likely to confirm a reliable diagnosis. Therefore, it must be assured that the radiologist views the medical image for a sufficient amount of time.
• the time threshold for complicated lesions may be higher than the time threshold for simple lesions.
• the location of small anomalies such as small pieces of cancer tissue may only be detectable and assessable at certain zoom levels. To avoid overlooking of such regions it is important that a certain zoom threshold is complied with.
• a minimum panning may be required. Otherwise a ROI may not be displayed properly.
• malfunctions of the heart may not be diagnosed from a perspective where the heart is covered by ribs.
• retinal diseases may only be found from a certain perspective.
• the ROI information of the method for image analysis comprises position information and/or size information indicating the position and/or size of the ROI.
• ROI information may, for example, be directly given by a marking in the medical image, such as a red circle around a supposed bone fracture. ROI information may also be given in the form of coordinates.
• the ROI information comprises vital information about a patient's injury or illness. Above all the location and size of the region where a patient ' s suffering originate from provides indispensable information for doctors.
• the first annotations are provided by one or more users and/or generated by automated image analysis. They may be provided in advance or in parallel with the second annotations of another reader.
• the method for image analysis of a medical image further comprises issuing the result of the quality check, and/or adapting the image according to the quality check. Whether the first and second ROI match or not and whether the viewing data fulfill certain requirements is decisive for the subsequent treatment of a patient.
• the outcome of the quality check may be issued to the reader. For example, the result may be displayed on the display or issued via an audio message.
• the reader may adapt the image or even switch to another display.
• a required adaption may also be supported by an automatism or even be performed totally automatically.
• the method for image analysis of a medical image further comprises receiving further annotations of said medical image, further ROI information indicating one or more further ROI within said medical image and further viewing data including display data and/or viewing time with which the further ROI has been displayed on a display and based on which the further annotations have been made, and checking the quality of the further annotations by comparing the further ROI information to the first and /or second ROI information and by checking the further viewing data.
• further ROI information indicating one or more further ROI within said medical image and further viewing data including display data and/or viewing time with which the further ROI has been displayed on a display and based on which the further annotations have been made
• checking the quality of the further annotations by comparing the further ROI information to the first and /or second ROI information and by checking the further viewing data.
• the first annotations and the first ROI information are based on having viewed the medical image on a high resolution display and the second ROI has been displayed on a low resolution display. That is, the second annotations are based on medical images displayed at low resolution. Since treatment decisions may be solely based on these second annotations the quality check of the second annotations is particularly important.
• the system further comprises an output unit configured to issue the result of the quality check, and/or an adaption unit configured to adapt the image according to the quality check.
• the output unit may be comprised in the display such that the result of the quality check could directly be displayed on the image. Likewise, the output unit may be configured to issue the result via an audio signal or message.
• the adaption unit may be configured to adapt the portion of the image viewed. Apart from scrolling or rotating the adaption unit may also be configured to change the zoom level. In order to display three-dimensional images, the adaption unit may also possess a panning function.
• the second input unit is further configured to receive further annotations of said medical image, further ROI information indicating one or more further ROI within said medical image and further viewing data including display data and/or viewing time with which the further ROI has been displayed on a display and based on which the further annotations have been made, and to check the quality of the further annotations by comparing the further ROI information to the first and/or second ROI information and to check the further viewing data.
• Said system could be a tele- radiology system or a brokered service system where three or more radiologists or other doctors assess a medical image with their respective displaying devices.
• a method for recording image- related information related to a medical image which comprises
• detecting and recording viewing data including viewing time with which the ROI is displayed and based on which the annotations are made.
• a device for recording image- related information related to a medical image comprising:
• a receiver configured to receive the medical image
• a display configured to display the medical image
• a detection and recording unit configured to
• the viewing patterns of a user watching a medical image can be monitored. Apart from ROI information, display data and viewing time data zoom level and/or panning level data may also be recorded. The annotations made may then be evaluated in the light of the viewing pattern monitored.
• the device may particularly be used as second input unit of the system for image analysis of a medical image.
• Fig. 1 shows a flow chart of a first embodiment of a method for image analysis of a medical image according to the present invention
• Fig. 2 shows a flow chart of a second embodiment of a method for image analysis of a medical image according to the present invention
• Fig. 3 shows a schematic diagram of a first embodiment of a system for image analysis of a medical image according to the present invention
• Fig. 4 shows a schematic diagram of a second embodiment of a system for image analysis of a medical image according to the present invention
• Fig. 5A, 5B and 5 C show a medical image as viewed on different displays at different zoom levels
• Figs. 6A, 6B and 6C show a medical image with a zooming guidance for proper displaying
• Fig. 7 shows a schematic diagram of an embodiment of a device for recording image-related information related to a medical image.
• Fig. 1 shows a flow chart of a first embodiment of a method for image analysis of a medical image according to the present invention.
• a first reader 1 makes first annotations 1 1 of the medical image 100 and records first ROI information 12.
• the first annotations 11 may represent a preliminary diagnosis, patient information or time and date information, for example.
• a second reader 2 to whom said medical picture 100 is forwarded as well, makes second annotations 21 of the medical image 1 and records second ROI information 22.
• viewing data 23 are created by the second reader 2.
• the viewing data 23 comprise zoom level data 231, panning level data 232 and display resolution data 233.
• the data from the first reader 1 and second reader 2 are then used for a quality check 4 of the second annotations 21, wherein the second ROI information 22 is compared against the first ROI information 12.
• the quality check 4 will not be passed if the information of the two ROI does not match.
• the viewing data 23 fulfill a predetermined viewing data requirement 40, i.e. predetermined viewing data thresholds.
• the viewing data requirement 40 comprises a zoom level requirement 41, a panning level requirement 42 and a display resolution requirement 43.
• Fig. 2 shows a flow chart of a second embodiment of a method for image analysis of a medical image according to the present invention.
• a first reader 1 makes first annotations 11 of the medical image 100 and records first ROI information 12.
• a second reader 2 makes second annotations 21 of the medical image 100 at the same.
• the second reader 2 also records second ROI information 22 and second viewing data 23, wherein the second viewing data 23 include second viewing time data 234, second number of pixel data 235 and second display size data 236 corresponding to his/her display.
• a third reader 3 being part of the setup as well, records third annotations 31, third ROI information 32, and third viewing data 33 comprising third viewing time data 334, third number of pixel data 335 and third display size data 336 corresponding to third reader ' s display.
• the data from the first reader 1 , second reader 2 and third reader 3 are subsequently used for a quality check 4 of the third annotations 31 and second annotations 21, wherein the third ROI information 32 is compared against the second ROI information 22 and first ROI information 12. It is checked further whether the viewing data 23 and 33 fulfill a
• said viewing data requirement 40 comprises a viewing time threshold 44. It may, for example, be required that a radiologist views the medical image for at least five minutes.
• the viewing data requirement 40 further comprises a number-of-pixels threshold 45 and a display size threshold 46. In fact, the number-of-pixels threshold 45 and the display size threshold 46 may be combined to a display resolution threshold. The result of the quality check 4 is then issued to all readers 1 , 2 and 3 so they can adapt their viewports in case the quality check 4 has not been passed.
• Fig. 3 shows a schematic diagram of a first embodiment of a system 5 for image analysis of a medical image according to the present invention.
• the system 5 comprises a first input unit 6, a second input unit 7 and a quality check unit 8.
• the quality check unit 8 provides a medical image 100 to the first input unit 6 and to the second input unit 7.
• the first input unit 6 then makes first annotations 61 on the medical image using automated image processing.
• These annotations and first ROI information 62 which are also gathered automatically in this embodiment, are then forwarded to the quality check unit 8.
• the quality check unit 8 stores these data and passes them on to the second input unit 7.
• a radiologist may then use the second input unit 7 to make up his own mind and to assess the image analysis of the first input unit.
• the radiologist denotes which lesion he/she presumes and also the size and position of the lesion suspected. That is, the radiologist enters second annotations 71 and second ROI information 72 in the second input unit 7.
• the second input unit 7 also records the radiologist ' s viewing data 73. Together with the second annotations 71 and the second ROI information 72 these data are then sent back to the quality check unit 8, which performs a quality check on the second annotations 71. If the second annotations 71 are deemed to be based on a defective review, a third input unit may be required.
• Fig. 4 shows a schematic diagram of a second embodiment of a system 5 for image analysis of a medical image according to the present invention.
• the system 5 comprises a first input unit 6, a second input unit 7, a quality check unit 8, an output unit 9 and an adaption unit 10.
• the second input unit 7, the quality check unit 8, the output unit 9 and the adaption unit 10 are comprised within a single device, wherein said device is a smartphone.
• the second input unit 7 receives the medical image plus related data from the first input unit 6 and forwards the image to the output unit 9, namely the
• the second input unit 7 collects second annotations, second ROI information and viewing data and forwards these to the quality check unit 8, which subsequently checks the quality of the second annotations using the data from the first input unit 6.
• the result of this quality check 4 is then directly presented to a user by means of the display 9.
• the user may then adapt the medical image by using the adaption unit 10.
• the quality check unit 8 controls whether the image is now displayed according to predefined requirements. These predefined requirements may originate from the quality check unit 8 itself, but may also be provided by the first input unit 6. The result of the checking after the adaption may also be presented to the user on the display 9.
• Fig. 5A, 5B and 5 C show a medical image as viewed on different displays at different zoom levels.
• the figs show a human thorax comprising a clinical anomaly.
• Fig. 5A shows the image as viewed on a first device having screen diagonal of approximately 25 inches
• the mobile used to display Figs. 5B and 5C has a display diagonal of about 8 inches. That is, the anomaly as viewed in Fig. 5 A may be recognized easily, whereas the smaller viewport as shown in Fig. 5B is too small to recognize any anomaly.
• a radiologist receiving the image as depicted in Fig. 5B is not capable of making a qualified opinion.
• said small display size suffices if the zoom level is adapted accordingly as shown in Fig. 5C. That is, if the radiologist views the thorax image on an 8 inches display he/she may only assess the anomaly if the zoom level is appropriate. In order to ensure that the radiologist uses a sufficient zoom level the zoom levels used may be recorded by the mobile and sent to a quality check unit.
• Figs. 6A, 6B and 6C show a medical image with a zooming guidance for proper displaying.
• a human thorax with a lymphadenopathy FIG. 6 A shows the medical image in a form that is not appropriate for diagnosis.
• ROI information were provided along with the image in accordance with the present invention, a proper diagnosis could be made.
• Fig. 6B depicts how said ROI information may be transferred, namely by marking around the anomaly in the image. This marking represents a guidance for zooming. Using the ROI marking to find an appropriate zoom level, the lymphadenopathy may be displayed in an optimal manner. The corresponding image is depicted in Fig. 6C.
• Fig. 7 shows a schematic diagram of an embodiment of a device 70 for recording image-related information related to a medical image 100.
• the device 70 comprises a receiver 75, a display 76 and a detection and recording unit 77.
• the display 76 displays the image 100.
• a radiologist subsequently makes annotations. These are recorded by the detection and recording unit 77.
• the detection and recording unit 77 furthermore detects possible regions of interest and records related information such as coordinates and sizes. Apart from this the viewing data of the radiologist are monitored. For example, it is recorded how long and at what zooming level which area of the image has been viewed on the display 76.
• said device may represent the second input unit 7 of the system 5 according to the present invention.
• a computer program may be stored/distributed on a suitable non-transitory medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
• a suitable non-transitory medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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