Table 1.

The BLEU^a, METEOR^b, and ROUGE-L^c scores of the generated reports by various methods on the IU X-RAY data set.

Methods	IU X-RAY
	BLEU-1	BLEU-2	BLEU-3	BLEU-4	BLEU-Ad	METEOR	ROUGE-L
R2GEN	0.470	0.304	0.219	0.165	0.229	N/Ae	0.371
CAf	0.492	0.314	0.222	0.169	0.235	0.193	0.381
CMCLg	0.473	0.305	0.217	0.162	0.228	0.186	0.378
PPKEDh	0.483	0.315	0.224	0.168	0.236	N/A	0.376
M2TRi	0.475	0.309	0.222	0.170	0.234	0.191	0.375
R2GENCMNj	0.486	0.317	0.232	0.173	0.241	0.192	0.390
ALIGNTRANSFORMER	0.484	0.313	0.225	0.173	0.237	N/A	0.379
KNOWMATk	0.496	0.327	0.238	0.178	0.248	N/A	0.381
CMM-RL	0.494	0.321	0.235	0.181	0.246	0.201	0.384
CMCAl	0.496	0.349	0.268	0.215	0.277	0.209	0.392
ORGANm	0.510	0.346	0.255	0.195	0.265	0.205	0.399
ClinicalBLIP	0.433	0.343	0.290	0.254	0.296	0.570	0.534

^aBLEU: Bilingual Evaluation Understudy.

^bMETEOR: Metric for Evaluation of Translation With Explicit Ordering.

^cROUGE-L: Recall-Oriented Understudy for Gisting Evaluation-L.

^dBLEU-A: average of the BLEU-2/3/4 scores.

^eN/A: not available.

^fCA: contrastive attention.

^gCMCL: competence-based multimodal curriculum learning.

^hPPKED: Posterior-and-Prior Knowledge Exploring-and-distilling.

ⁱM2TR: Meshed-Memory Transformer.

^jR2GENCMN: R2GEN enhanced with cross-modal memory networks.

^kKNOWMAT: Knowledge Matters.

^lCMCA: Cross-Modal Contrastive Attention Model.

^mORGAN: Observation-Guided Radiology Report Generation Framework.