Data Analysis Report for MURA

MURA is a dataset of musculoskeletal radiographs consisting of 14,982 studies from 12,251 patients, with a total of 40,895 multi-view radiographic images. Each study belongs to one of seven standard upper extremity radiographic study types: elbow, finger, forearm, hand, humerus, shoulder and wrist.

Components of MURA dataset

MURA dataset comes with train, valid and test folders containing corresponding datasets, train.csv and valid.csv contain paths of radiographic images and their labels. Each image is labeled as 1 (abnormal) or 0 (normal) based on whether its corresponding study is negative or positive, respectively

Sometimes, these radiographic images are also referred as views.

Components of train and valid set

• train set consists of seven study types namely:

  XR_ELBOW XR_FINGER XR_FOREARM XR_HAND XR_HUMERUS XR_SHOULDER XR_WRIST

• Each study type contains several folders named like:

  patient12104 patient12110 patient12116 patient12122 patient12128 ...

• These folders are named after patient ids, each of these folders contain one or more study, named like:

  study1_negative study2_negative study3_positive ...
  

• Each of these studys contains one or more radiographs (views or images), named like:

  image1.png image2.png ...

• Each view (image) is RGB with pixel range [0, 255] and varies in dimensions.

NOTE: all above points are true for test set, except the third point, the study folder are named like: study1 study2 ..

Some insightful plots

Plot of number of Patients vs study type

In train set XR_WRIST has maximum number of patients, followed by XR_FINGER, XR_HUMERUS, XR_SHOULDER, XR_HAND, XR_ELBOW and XR_FOREARM. X_FOREARM with 606 patients has got the least number. Similar pattern can be seen in valid set, XR_WRIST has the maximum, followed by XR_FINGER, XR_SHOULDER,XR_HUMEROUS, XR_HAND,XR_ELBOW, XR_FOREARM.

Plot of number of patients vs study count

Patients of a study type might have multiple studys, like a patient may have 3 studys for wrist, independent of each other.

The following plot shows variation of number of patients with number of studys

NOTE study count = number of studies, so if 4 patients have study count 3, that means 4 patients have undergone 3 studys for a given study type

Patients of XR_FOREARM and XR_HUMEROUS study types have either 1 study or 2 only.
Patients of XR_FINGER, XR_HAND and XR_ELBOW have upto 3 studys.
Patients of XR_SHOULDER and XR_WRIST have upto 4 studys

Plot of number of studys vs number of views

Each study may have one or more number of views, the following plot variation of number of views per study in train dataset

Maximum number of views per study can be found in XR_SHOULDER, there is a study in it which has as many as 13 images (views), similarlyy XR_HUMEROUS has a study with 10 images. It can be seen that most of the studys have either 2, 3 or 4 images.