JP2004164320A - Data storage device, data storage method, program and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively utilize data of a specific data structure and a storage device. <P>SOLUTION: This medical data storage device is provided with a primary storage device, a secondary storage device, a control part, a date data recording means, a deletion possibility recording means, a restoring means, a deletion priority flag means, a deletion inhibiting means and a deletion means. The deletion priority flag means adds the deletion priority flag to medical data when the deletion of the medical data is given top priority. The deletion inhibiting means adds the deletion inhibition flag to the medical data which should not be deleted. The deletion means moves the medical data from the primary storage device to the secondary storage device. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data storage device, a data storage method, a program, and a storage medium.
[0002]
[Prior art]
The digitized medical data includes medical data such as medical X-ray medical data, CT scan medical data, and MRI medical data, and has a large capacity. A medical data system that holds medical data has a large-capacity storage device for holding a sufficiently large amount of medical data. However, a large-capacity storage device generally has a slow access speed, and a high-speed and large-capacity storage device is expensive. It is.
[0003]
Therefore, the medical data system is provided with a small-capacity, high-speed primary storage device and a low-speed, large-capacity secondary storage device to minimize the cost and increase the capacity of the large-capacity data. It achieves storage and high-speed data access.
[0004]
Conventionally, in order to make the best use of both the primary storage device and the secondary storage device, when the remaining capacity of the primary storage device becomes insufficient, a doctor evaluates each medical data and needs to perform the manual operation. The medical data having a low probability is transferred to the secondary storage device, and an area for new medical data is secured in the primary storage device. For this reason, the burden on the doctor is large, and there is a possibility that it will adversely affect diagnostic operations such as image interpretation work.
[0005]
Therefore, in order to automate the deletion of medical data from the primary storage device, a method of sequentially deleting the oldest medical data has been adopted.
[0006]
[Problems to be solved by the invention]
However, according to the international standard DICOM (digital information and communication in medicine) regarding digital medical data and the MIPS (medical image processing system) standard proposed by the Japan Radiation Equipment Manufacturers Association (JIRA), medical data is used as a route for patient data. It has a tree structure. For this reason, if only the generation date of medical data is managed, it may not be possible to interpret the time series of medical medical data, and there may be inconveniences such as loss of data links.
[0007]
The present invention has been made to solve such a conventional problem, and has as its object to effectively utilize data and a storage device having a specific data structure.
[0008]
[Means for Solving the Problems]
A data storage device according to the present invention includes a storage unit configured to store a set of related data as a data group, and to store a set of data to be collectively deleted in the data group as a deleted data group. Data date and time recording means for adding a data date and time indicating the new or old data to the data, and deleting the deleted data group in the data group including the predetermined data when the data date and time of the predetermined data is newer than a predetermined value There is provided a deletion prohibition unit that prohibits the deletion, and a deletion unit that deletes the deletion data group that is not deletion prohibition from the storage unit. Thereby, the data and the storage device having the specific data structure can be effectively used.
[0009]
The data storage device according to the present invention further has an auxiliary storage unit that has a larger capacity than the storage unit and stores the deleted data, so that a backup of the deleted data can be generated. Re-storing in the storage means is also possible.
[0010]
The data storage device according to the present invention may further include a deletion priority unit that generates an index indicating that the deletion data group is to be deleted with priority when the deletion data group is to be deleted with priority. Thereby, the storage device can be more effectively utilized.
[0011]
In the data storage device according to the present invention, since the deleted data group is composed of one data, the free space of the storage device can be secured while leaving the maximum number of data.
[0012]
In the data storage device according to the present invention, the data structure may be a tree structure, and the deleted data group may be composed of a plurality of layers of data, for example, data from the layer of the data of interest to the highest layer.
[0013]
In the data storage device according to the present invention, the priority of the data can be reset by further including moving means for moving the data stored in the auxiliary storage means to the storage means again.
[0014]
In the data storage device according to the present invention, if the data date and time is the date and time when the data was stored in the storage unit or the date and time when the data was last referenced, management based on data availability and frequency of use. Is possible.
[0015]
In the data storage device according to the present invention, the data storage device further includes a control unit that measures a free space of the storage unit, and deletes the deleteable data group that can be deleted by the deletion unit when the free space is equal to or less than a predetermined value. By providing, the capacity of the storage device can be utilized to the limit.
[0016]
In the data storage device according to the present invention, the data has been excellently used as medical data having a tree structure.
[0017]
According to the present invention, there is provided a data storage method in an apparatus having a storage unit for storing data and an auxiliary storage unit different from the storage unit, wherein a data storage step of storing data in the storage unit; A free space determining step of determining whether the free space is equal to or less than a predetermined value; a backup step of backing up data by an auxiliary storage means when the free space is equal to or less than a predetermined value; And deleting the stored data from the storage means. As a result, the data and the storage device having the specific data structure can be effectively used, a backup of the deleted data can be generated, and the data can be stored again in the first storage means.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment in which the present invention is applied to medical data will be described with reference to the drawings.
[0019]
Next, preferred embodiments of a data storage device, a data storage method, a program, and a storage medium according to the present invention will be described with reference to the drawings.
[0020]
[First Embodiment]
FIG. 1 is a schematic block diagram showing a medical data system which is a first embodiment of a data storage device and a data storage method according to the present invention, FIG. 2 is a block diagram of the data storage device of FIG. 1, and FIG. FIG. 4 is a block diagram showing the relationship between the data storage device and the medical data utilization device and the modality of FIG. 2; FIG. 4 is a conceptual diagram showing the data structure of medical data; FIG. 6 is a conceptual diagram showing a tree structure of other medical data to which a deletion prohibition flag is added, and FIG. 7 is a table and a diagram for managing storage and movement (deletion) of medical data. 8 is a block diagram showing the concept of moving (deleting) medical data, and FIG. 9 is a front view showing a screen for setting storage control of medical data.
[0021]
In FIG. 1, a medical data storage device 10 is connected to various medical data utilization devices 31, 32, 33 and modalities 21, 22, 23 via a LAN 100.
[0022]
The medical data utilization device is, for example, a medical image interpretation device, and the method of using image data includes (1) changing image characteristics in an image processing environment, (2) displaying an image on a display device such as a liquid crystal display, Alternatively, there are various types such as (3) generating a hard copy of an image using an output device such as a laser printer or a film printer.
[0023]
The modality is, for example, a medical image generating device such as an image scanner (CT, MRI, US, PET), an X-ray imaging device, and a storage phosphor reader.
[0024]
3, the medical data storage device 10 includes a primary storage device 101, a secondary storage device 102, and a control unit 103. The primary storage device 101 is a high-speed accessible storage device, for example, a magnetic disk device, while the secondary storage device 102 is, for example, a magneto-optical disk device. The control unit 103 is, for example, a computer.
[0025]
2, a medical data storage device 10 includes a data storage device 201, a deletable storage device 202, a re-storage device 203, a deletion priority flag, in addition to a primary storage device 101, a secondary storage device 102, and a control unit 103. Means 204, deletion prohibition means 205, and deletion means 206.
[0026]
The data date and time recording unit 201 attaches a data date and time to the medical data acquired by the medical data storage device 10 and transfers the data to the deletable recording unit 202. When the medical data received from the data date and time recording means 201 becomes removable, the deletion possible recording means 202 records that the medical data can be deleted, and stores it in the primary storage device 101. The re-storing unit 203 transfers the medical data once moved from the primary storage device 101 to the secondary storage device 102 to the data date and time recording device 201 in order to move the medical data to the primary storage device 101 again. When the medical data can be deleted with priority, the deletion priority flag unit 204 acquires the medical data from the primary storage device 101, attaches a deletion priority flag, and transfers the data to the deletion unit 206. The deletion prohibition unit 205 acquires medical data that should not be deleted from the primary storage device 101, attaches a deletion prohibition flag to the medical data, and transfers the medical data to the deletion unit 206. The deletion unit 206 moves the medical data to be deleted from the primary storage device 101 to the secondary storage device 102.
[0027]
The control unit 103 measures the free space of the primary storage device 101, and controls the primary storage device 101, the secondary storage device 102, the deletion priority flag unit 204, the deletion prohibition flag unit 205, and the deletion unit 206. By managing the free space of the primary storage device 101 by the control unit 103, the primary storage device 101 can be used up to the limit of the capacity.
[0028]
The secondary storage device 102 has a larger capacity than the primary storage device 101 but has a slower access speed, uses a relatively inexpensive storage device, and stores infrequently used medical data. Since the price per unit capacity of the primary storage device 101 is relatively expensive, a storage device having a smaller capacity than the secondary storage device 102 is used. Only medical data that is highly usable or frequently used is stored in the primary storage device 101, and the user can access necessary medical data at high speed. On the other hand, medical data with low availability and frequency of use are moved to the secondary storage device 102.
Therefore, the capacity of the expensive primary storage device 102 can be minimized, and the cost performance is extremely high.
[0029]
The medical data acquired from the modalities 21 to 23 are first stored in the primary storage device 101 together with the data date and time. The control unit 103 manages the medical data stored in the primary storage device 101 based on the data date and time, and stores new medical data in the primary storage device 101. The data date and time are old and new indices of the medical data, and the storage date and time of the medical data, the last reference date and time, the resave date and the like are used. The storage date and time is the date and time when the medical data was first generated and stored, and the last reference date and time is the date and time when the user last referred to the medical data. The resave date and time is the date and time when the medical data was moved to the secondary storage device 102 and then returned to the primary storage device 101 again.
[0030]
Since the analysis of medical data is performed based on the latest medical data, the medical data immediately after being stored in the primary storage device 101 is likely to be used in the near future, and should not be deleted. Also, it is possible to judge that the resaved medical data and the recently referenced medical data are likely to be used in the near future, and are in the same situation as the first saved medical data. As described above, the deletion of medical data having a new data date and time should be prohibited. Therefore, the deletion prohibition flag means 205 adds a deletion prohibition flag to the medical data. As a result, the deletion of the medical data to which the deletion prohibition flag is added and the higher-order medical data related thereto are prohibited.
[0031]
Although the storage date and time and the re-save date and time may be managed separately as the data date and time, they can be managed without distinction because they have the same meaning as to the availability of medical data. When the storage date and time and the re-save date and time are not distinguished, only one area for data management is sufficient, and the configuration of the medical data storage device 10 can be simplified.
[0032]
A range in which deletion is prohibited can be set in various ways. For example, when a deletion prohibition flag is added to image data, deletion of all data of the patient to which the image data belongs is prohibited. Alternatively, only the medical data to which the deletion prohibition flag is added, or the related data in a predetermined range of layers from the medical data is prohibited from being deleted. When at least one piece of medical data is prohibited from being deleted as described above, a set of medical data that is simultaneously prohibited from being deleted is referred to as a “data group”.
[0033]
The management of the data date and time in one data group may be performed for all medical data included in the data group, or may be limited to a specific hierarchy. For example, it is possible to determine whether to delete the entire data group by focusing only on the new and old image data. When the new and old reference medical data are set in the data group as described above, the medical data is called target data. The attention data may be set for a plurality of layers. When all the medical data in the data group is to be subjected to the new / old determination, it is determined that the data of interest is not set.
[0034]
The medical data stored in the secondary storage device 102 can be directly accessed. However, if the medical data is re-stored in the primary storage device 101 again by the operation of a user such as a doctor or a technician, high-speed access becomes possible. Convenience increases.
[0035]
The control unit 103 monitors the free space of the primary storage device 101 and, when the free space becomes equal to or less than the predetermined capacity, moves the medical data whose data date and time is old to the secondary storage device 102. The predetermined capacity can be variously set. For example, a capacity that is 10 times or less the average capacity of the medical data stored at one time can be adopted. To transfer the medical data from the primary storage device 101 to the secondary storage device 102, the medical data is copied from the primary storage device 101 to the secondary storage device 102, and then the medical data is deleted from the primary storage device 101.
[0036]
As shown in FIG. 4, the medical data conforms to the DICOM standard, and includes four-layer medical data of patient (examinee) data D1, examination data D2, series data D3, and image data D4. One or a plurality of test data (Ti1 to Tiu) corresponds to each patient data (for example, patient Pi), and one or a plurality of series data (Sij1 to Sijv) corresponds to each test data (for example, test Tij); One or a plurality of medical image data (IMijk1 to IMijkw) correspond to each series data (for example, Sijk). Each test data includes a diagnosis result for each periodic health check, and the interpretation result is included in the test data (Ti1 to Tiu). The series data includes the results of different examinations such as the chest and abdomen in one examination. One or more images correspond to each series data.
[0037]
Patient data includes name and gender, examination data includes date and time, patient age, series data includes date and time, modality data, image data includes image size, and storage date and time , Reference date and time are added.
[0038]
The DICOM standard medical data has a tree structure in which one piece of patient data D1 is the highest-level medical data, and the lowest-level medical image data has the largest capacity. Therefore, generally, if only the image data is targeted for the medical data transfer, the free space of the primary storage device 101 can be secured most effectively. The same applies to other relatively large-capacity medical data to be moved. In this case, medical data having a relatively small capacity is left in the primary storage device 101, so that high-speed access is possible.
[0039]
The medical data to be moved (deleted) may not be one medical data such as one image data, but a plurality of related medical data (series data, examination data, patient data) may be moved at the same time. For example, in FIG. 5, the inspection data A-1 is set as the root (highest hierarchy), and the series data 1, series data 2, series data 3, image data 1, image data 2, image data 3, image data 4, and image data 5 are collectively moved to the secondary storage device 102. A set of medical data that is moved (deleted) at the same time as moving (deleting) the medical data in this way is called a “deleted data group”.
[0040]
In the medical data shown in FIG. 5, it is assumed that a rule is set that the current date and time is set to November 16, 2002 and that a deletion prohibition flag is attached to data within one week from the current date and time. Since the reference date and time of the image data 1 in FIG. 5 is November 11, 2002, and is within one week from November 16, 2002, a deletion prohibition flag (indicated by a black circle) is added based on the rule. . It is also assumed that the data group is set to all data with one patient data as a root. Accordingly, the deletion prohibition of the image data 1 prohibits deletion of all medical data of the patient data A, and attaches a deletion prohibition flag to all the medical data. When a rule is set to delete only image data to perform efficient data deletion, in addition to image data 1, image data 2, image data 3, image data 4, and image data 5 Is given a deletion prohibition flag.
On the other hand, since the reference date and time of the image data 10 of FIG. 5 is 2002/11/06 and is earlier than 2002/11/09 which is one week of 2002/11/13, a deletion prohibition flag is added as old medical data. do not do.
[0041]
FIG. 6 is medical data of the current date and time and the rule similar to FIG. 5, and the reference date and time of the test data A-3 is 2002/11/16. A deletion prohibition flag (black circle) is added to the examination data A-3 based on the rule, and all medical data of the patient data A are prohibited from being deleted.
[0042]
In contrast to the above prohibition of deletion, there are situations in which a patient should be preferentially deleted, such as when the patient dies or the patient cannot go to hospital due to moving or the like. In such a situation, the deletion prohibition flag is released and a deletion priority flag is added. The medical data to which the deletion priority flag is attached is deleted prior to other medical data.
[0043]
In FIG. 7, the data group defines the highest hierarchy and the lowest hierarchy, and sets a target data, a deletion data group, and one or more deletion data groups. Further, the oldest data date and time in each data group, whether or not the deletion prohibition flag is added, whether or not the deletion priority flag is added, and the current storage location of each deleted data group (primary storage device or secondary storage device) Device) is detected and registered. Referring to the table of FIG. 7, it can be determined whether or not all medical data should be deleted.
[0044]
In FIG. 8, from one tree structure stored in the primary storage device 101 of the medical data storage device 10, the deletion data groups DDG1 and DDG2 are moved to the secondary storage device, and the primary storage device 101 is deleted. Has been removed from The medical data storage device manages the storage location of each medical data while storing the data structure of the medical data.
[0045]
9, the operation screen of the medical data storage device 10 includes a data storage period input box 901, a data storage period unit input box 902, a target data selection box 903, a delete data selection button 904, and an input of the number of upper layers in the data group setting. A box 905, a top layer setting button 906, a patient data input box 907 for setting a deletion priority flag, a search button 908, a data structure display screen 909, and a setting button 910 are provided.
In the data storage period unit input box 902, select the unit of the period until the removal prohibition is released, “year”, “month”, “week”, “day”, “hour”, and “minute” from the pull-down menu. In the data storage period input box 901, a numerical value of the period is input from the keyboard.
[0046]
In the attention data selection box 903, one or a plurality of attention data is selected from the image data, the series data, and the inspection data in the pull-down menu, or a setting without designating the attention data is performed.
[0047]
With the delete data selection button 904, one or a plurality of medical data are selected from image data, series data, examination data, and patient data by radio buttons, and a medical data hierarchy forming a delete data group is selected.
[0048]
In the data group setting, it is set how many layers from the target data are included in the same data group, and the number of layers from the target data is entered in the upper layer number input box 905 by keyboard. To include the medical data (patient data) up to the highest hierarchy in one data group, the highest hierarchy setting button 904 is checked.
[0049]
In setting the deletion priority flag, the patient is input by inputting a patient name, a patient ID, and the like in the patient data input box 907, and the patient is searched by picking a search button 908. I do. When the patient is extracted, all the medical data of the patient are displayed on the data structure display screen 909 together with the data structure. On the data structure display screen 909, by picking one or a plurality of medical data, medical data to which a deletion priority flag is to be attached can be selected. When the selection is completed, by selecting the setting button 910, a deletion priority flag is added to the selected medical data.
[0050]
Next, a first data storage method performed by the data storage device 10 will be described with reference to the drawings. FIG. 10 is a flowchart showing the first data storage method.
[0051]
In FIG. 10, the medical data storage device 10 manages storage and deletion (movement) of an image by the following steps.
[0052]
Step 50: The steps after Step 51 are executed when the computer 103 is started or at a timing after a predetermined period.
[0053]
Step 51: The free space of the primary storage device 101 is measured by the control unit 103, and the process proceeds to step 52.
[0054]
Step 52: It is determined whether or not the free space is equal to or less than a predetermined value. When the value is equal to or smaller than the predetermined value, the process proceeds to step 53.
Since the primary storage device 101 is used until the free space reaches the predetermined value, the capacity of the primary storage device can be utilized to the limit.
[0055]
Step 53: Update the deletion prohibition flag with reference to the data date and time of all the medical data in the primary storage device 101. Next, the routine proceeds to step 54. The deletion prohibition flag is added to the image data when the storage date and time or the reference date and time, which is the data date and time of the image data, is newer than a predetermined date and time, for example, the date and time one week before the present. If the deletion prohibition flag is provided among the image data that does not correspond, the deletion prohibition flag is deleted. The deletion prohibition flag prevents deletion of all medical data in the same data group. The deletion prohibition flag is added to the medical data of the deletion data group.
[0056]
Step 54: It is determined whether or not there is medical data to which a deletion flag has been added. If there is medical data to which a deletion flag has been added, the process proceeds to step 55, where there is medical data to which a deletion flag has been added. If not, the process proceeds to step 56.
[0057]
Step 55: The oldest medical data is selected from the medical data of the deleted data group to which the deletion flag is not attached, and the process proceeds to step 57.
[0058]
Step 56: Select the deleted data group including the oldest medical data from the medical data of all the deleted data groups, and proceed to step 57.
[0059]
Step 57: In the medical data of the deletion data group selected in steps 55 and 56, the deletion possibility is recorded by the deletion possibility recording means 202, and the medical data is copied to the secondary storage device 102. Next, the process proceeds to a step 58.
[0060]
Step 58: Delete the selected deleted data group from the primary storage device 101, and return to step 51. Thereafter, steps 53 to 58 are repeated until the free space of the primary storage device 101 becomes larger than a predetermined value.
[0061]
As described above, medical data with a low priority is automatically selected based on the data date and moved to the secondary storage device 102, so that only medical data with a high priority is always selectively stored in the primary storage device 101. Will be saved. Therefore, high-speed medical data can always be accessed at high speed, and the capacity of the expensive primary storage device 101 can be minimized.
[0062]
Note that the timing for measuring the free storage capacity of the primary storage device 101 can be variously set, such as when medical data is stored in the primary storage device.
[0063]
The primary storage device 101 is not limited to a magnetic disk device, but may be any storage device having a short access time. Also, the secondary storage device may be an optical disk auto changer on which a plurality of optical disks are mounted.
[0064]
Next, a second data storage method performed by the medical data storage device 10 will be described with reference to the drawings. FIG. 11 is a flowchart showing the second data storage method.
[0065]
In FIG. 11, the medical data storage device 10 manages image storage and deletion (movement) by the following steps.
[0066]
Step S1101: Similar to step 51 of FIG. 10, the free space of the primary storage device 101 is measured.
[0067]
Step S1102: Similar to step 52 in FIG. 10, the free space is compared with a predetermined value.
[0068]
Step S1103: One data group including the data of interest to which the deletion priority flag has been added is selected, and the process proceeds to step S1104.
[0069]
Step S1104: It is determined whether or not all data groups including the data of interest to which the deletion priority flag has been added have been selected. If all data groups have been selected, the process proceeds to step S1104. If the selection has not been completed, the process returns to step S1101, and steps S1102 to S1104 are repeated until all the selections are completed.
[0070]
Step S1105: The deletion prohibition flag is updated as in step 53 of FIG.
[0071]
Step S1106: Similar to step 54 of FIG. 10, it is determined whether or not there is data of interest to which the deletion prohibition flag is not attached.
[0072]
Step S1107: As in step 55 of FIG. 10, the oldest deleted data group is selected from among the deleted data to which no deletion flag has been added.
[0073]
Step S1108: The oldest deleted data group is selected as in step 56 of FIG.
[0074]
Step S1109: The free space at the time when the selected deleted data group is deleted is compared with a predetermined value, and when it is larger than the predetermined value, the process proceeds to step S1110, and when it is smaller than the predetermined value, the process returns to step S1106.
[0075]
Step S1110: Delete the selected deletion data group.
[0076]
In the second data storage method, in addition to the effect of the first data storage method, a deletion data group to be deleted with priority is preferentially deleted, and more medical data can be used in the primary storage device 101. This has the effect.
[0077]
[Second embodiment]
FIG. 12 is a block diagram showing a second embodiment of the data storage device and the data storage method according to the present invention. The same or corresponding parts as those in the first embodiment (FIG. 1) are denoted by the same reference numerals, and description thereof will be omitted. The data storage method is the same as that in the first embodiment, and a description thereof will be omitted.
[0078]
In FIG. 12, one or a plurality of medical data storage devices 200 other than the medical data storage device 10 are connected to communication means such as the Internet IN, and the Internet IN has medical data utilization devices 31, 32 and modalities 21, 22, 23. Is connected.
[0079]
By connecting the plurality of medical data storage devices 10 and 200 via the communication means in this way, various storage modes can be realized. For example, many storage devices may be utilized. For example, the medical data can be sequentially transferred to a storage device having a gradually increasing capacity, the access speed can be set in a stepwise manner, or a very large-scale storage device can be installed in a remote place to permanently store the medical data. It is also possible to use a medical image generated in a remote place.
[0080]
[program]
A program for executing the above-described first data storage method on a general-purpose computer includes a program code for executing steps 50 to 58 in FIG. 10, and a program for executing the above-described second data storage method on a general-purpose computer is illustrated in FIG. 11 includes a program code for executing steps S1101 to S1110.
[0081]
[Storage medium]
The first or second data storage method described above can be implemented by a device other than the data storage device of FIGS. 1 to 3, for example, a general-purpose computer. It may be set in an external storage device of a computer and executed by a CPU or the like in accordance with an instruction of an operator or the like.
[0082]
In the above embodiments, the storage and deletion of tree-structured data, particularly medical data that has achieved excellent results, have been described. However, the present invention has a specific data structure, and is capable of defining a data group and a deletion data group. It is needless to say that the present invention can be applied to such data.
[0083]
【The invention's effect】
According to the present invention, data and a storage device having a specific data structure can be effectively used.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing a medical data system including one embodiment of a data storage device according to the present invention.
FIG. 2 is a block diagram of the data storage device of FIG. 1;
FIG. 3 is a block diagram showing a relationship between the data storage device of FIG. 2, a medical data utilization device, and a modality.
FIG. 4 is a conceptual diagram showing a data structure of medical data.
FIG. 5 is a conceptual diagram showing a tree structure of medical data to which a deletion prohibition flag is added.
FIG. 6 is a conceptual diagram showing a tree structure of other medical data to which a deletion prohibition flag is added.
FIG. 7 is a block diagram illustrating a concept of moving attention data.
FIG. 8 is a table showing attributes for managing medical data.
9 is a front view showing a screen for executing control settings for medical data management in FIG. 8;
FIG. 10 is a flowchart illustrating a first embodiment of a data storage method performed by the data storage device.
FIG. 11 is a flowchart showing a second embodiment of the data storage method performed by the data storage device.
FIG. 12 is a block diagram showing another example of the medical data system.
[Explanation of symbols]
31,32,33 Medical data storage device
101 Primary storage device
102 Secondary storage device
201 Data date recording means
203 Re-saving means
204 deletion priority flag means
205 Deletion prohibition flag means
206 Deletion means

Claims (14)

Storage means for storing a set of related data as a data group and storing a set of data to be collectively deleted in the data group as a deleted data group;
Data date and time recording means for adding data date and time indicating new or old data to predetermined data in the data group,
When the data date and time of the predetermined data is newer than a predetermined value, a deletion prohibition unit that prohibits deletion of a deletion data group in a data group including the predetermined data,
Deleting means for deleting the deletion data group which is not prohibited from being deleted from the storage means;
Data storage device provided with. 2. The data storage device according to claim 1, further comprising an auxiliary storage unit having a larger capacity than the storage unit and storing the deleted data. 2. The apparatus according to claim 1, further comprising: a deletion priority unit configured to generate an index indicating that the deletion data group is to be deleted with priority when the deletion data group is to be deleted with priority. Or the data storage device according to 2. 4. The data storage device according to claim 1, wherein the deletion data group includes one piece of data. 4. The data storage device according to claim 1, wherein the data structure is a tree structure, and the deleted data group includes data of a plurality of layers. 4. The data storage device according to claim 1, wherein the data structure is a tree structure, and the deleted data group includes data from a layer of the data of interest to a top layer. 5. The data storage device according to claim 2, further comprising a moving unit that moves data stored in the auxiliary storage unit to the storage unit again. The data storage device according to claim 1, wherein the data date and time is a date and time when the data is stored in the storage unit. 8. The data storage device according to claim 1, wherein the data date and time is the date and time when the data was last referenced. A control unit for measuring a free space of the storage unit and deleting the deleteable data group that can be deleted by the deleting unit when the free space is equal to or smaller than a predetermined value. Item 10. The data storage device according to any one of Items 1 to 9. 11. The data storage device according to claim 1, wherein the data is medical data having a tree structure. In a data storage method in a device having storage means for storing data and auxiliary storage means different from the storage means,
A data storage step of storing data in the storage means;
Free capacity determining step of determining whether the free capacity of the storage means is equal to or less than a predetermined value,
In the free space determination step, when the free space is equal to or less than a predetermined value, a backup step of backing up data in the auxiliary storage means,
A deletion step of deleting the data backed up in the backup step from the storage unit;
Data storage method with. A computer-executable program having a program code for causing a computer to execute each step of the medical data storage method according to claim 11. A storage medium storing the program according to claim 13.

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